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Lindahl, Olof
Publications (10 of 140) Show all publications
Murayama, Y. & Lindahl, O. (2017). Sensitivity improvements of a resonance-based tactile sensor. Journal of Medical Engineering & Technology, 41(2), 131-140
Open this publication in new window or tab >>Sensitivity improvements of a resonance-based tactile sensor
2017 (English)In: Journal of Medical Engineering & Technology, ISSN 0309-1902, E-ISSN 1464-522X, Vol. 41, no 2, p. 131-140Article in journal (Refereed) Published
Abstract [en]

Resonance-based contact-impedance measurement refers to the application of resonance sensors based on the measurement of the changes in the resonance curve of an ultrasonic resonator in contact with a surface. The advantage of the resonance sensor is that it is very sensitive to small changes in the contact impedance. A sensitive micro tactile sensor (MTS) was developed, which measured the elasticity of soft living tissues at the single-cell level. In the present paper, we studied the method of improving the touch and stiffness sensitivity of the MTS. First, the dependence of touch sensitivity in relation to the resonator length was studied by calculating the sensitivity coefficient at each length ranging from 9 to 40 mm. The highest touch sensitivity was obtained with a 30-mm-long glass needle driven at a resonance frequency of 100 kHz. Next, the numerical calculation of contact impedance showed that the highest stiffness sensitivity was achieved when the driving frequency was 100 kHz and the contact-tip diameter of the MTS was 10 μm. The theoretical model was then confirmed experimentally using a phase-locked-loop-based digital feedback oscillation circuit. It was found that the developed MTS, whose resonant frequency was 97.030 kHz, performed with the highest sensitivity of 53.2 × 106 Hz/N at the driving frequency of 97.986 kHz, i.e. the highest sensitivity was achieved at 956 Hz above the resonant frequency.

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-59615 (URN)10.1080/03091902.2016.1239278 (DOI)27701917 (PubMedID)2-s2.0-84990201247 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2016-12-20 (andbra)

Available from: 2016-10-10 Created: 2016-10-10 Last updated: 2018-05-22Bibliographically approved
Alrifaiy, A., Borg, J., Lindahl, O. & Ramser, K. (2015). A lab-on-a-chip for hypoxic patch clamp measurements combined with optical tweezers and spectroscopy: first investigations of single biological cells (ed.). Paper presented at . Biomedical engineering online, 14, Article ID 36.
Open this publication in new window or tab >>A lab-on-a-chip for hypoxic patch clamp measurements combined with optical tweezers and spectroscopy: first investigations of single biological cells
2015 (English)In: Biomedical engineering online, ISSN 1475-925X, E-ISSN 1475-925X, Vol. 14, article id 36Article in journal (Refereed) Published
Abstract [en]

The response and the reaction of the brain system to hypoxia is a vital research subject that requires special instrumentation. With this research subject in focus, a new multifunctional lab-on-a-chip (LOC) system with control over the oxygen content for studies on biological cells was developed. The chip was designed to incorporate the patch clamp technique, optical tweezers and absorption spectroscopy. The performance of the LOC was tested by a series of experiments. The oxygen content within the channels of the LOC was monitored by an oxygen sensor and verified by simultaneously studying the oxygenation state of chicken red blood cells (RBCs) with absorption spectra. The chicken RBCs were manipulated optically and steered in three dimensions towards a patch-clamp micropipette in a closed microfluidic channel. The oxygen level within the channels could be changed from a normoxic value of 18% O 2 to an anoxic value of 0.0-0.5% O 2. A time series of 3 experiments were performed, showing that the spectral transfer from the oxygenated to the deoxygenated state occurred after about 227 ± 1 s and a fully developed deoxygenated spectrum was observed after 298 ± 1 s, a mean value of 3 experiments. The tightness of the chamber to oxygen diffusion was verified by stopping the flow into the channel system while continuously recording absorption spectra showing an unchanged deoxygenated state during 5400 ± 2 s. A transfer of the oxygenated absorption spectra was achieved after 426 ± 1 s when exposing the cell to normoxic buffer. This showed the long time viability of the investigated cells. Successful patching and sealing were established on a trapped RBC and the whole-cell access (Ra) and membrane (Rm) resistances were measured to be 5.033 ± 0.412 M Ω and 889.7 ± 1.74 M Ω respectively.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Applied Mechanics
Research subject
Industrial Electronics; Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-15236 (URN)10.1186/s12938-015-0024-6 (DOI)000353330300001 ()25907197 (PubMedID)2-s2.0-84928337538 (Scopus ID)ebc3778e-f4fc-49c8-a1c0-bf991c7677d6 (Local ID)ebc3778e-f4fc-49c8-a1c0-bf991c7677d6 (Archive number)ebc3778e-f4fc-49c8-a1c0-bf991c7677d6 (OAI)
Note
Validerad; 2015; Nivå 2; 20150428 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Nyberg, M., Jalkanen, V., Ramser, K., Ljungberg, B., Bergh, A. & Lindahl, O. (2015). Dual-modality probe intended for prostate cancer detection combining Raman spectroscopy and tactile resonance technology—discrimination of normal human prostate tissues ex vivo (ed.). Paper presented at . Journal of Medical Engineering & Technology, 39(3), 198-207
Open this publication in new window or tab >>Dual-modality probe intended for prostate cancer detection combining Raman spectroscopy and tactile resonance technology—discrimination of normal human prostate tissues ex vivo
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2015 (English)In: Journal of Medical Engineering & Technology, ISSN 0309-1902, E-ISSN 1464-522X, Vol. 39, no 3, p. 198-207Article in journal (Refereed) Published
Abstract [en]

Prostate cancer is the most common cancer for men in the western world. For the first time, a dual-modality probe, combining Raman spectroscopy and tactile resonance technology, has been used for assessment of fresh human prostate tissue. The study investigates the potential of the dual-modality probe by testing its ability to differentiate prostate tissue types ex vivo. Measurements on four prostates show that the tactile resonance modality was able to discriminate soft epithelial tissue and stiff stroma (p < 0.05). The Raman spectra exhibited a strong fluorescent background at the current experimental settings. However, stroma could be discerned from epithelia by integrating the value of the spectral background. Combining both parameters by a stepwise analysis resulted in 100% sensitivity and 91% specificity. Although no cancer tissue was analysed, the results are promising for further development of the instrument and method for discriminating prostate tissues and cancer

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-16285 (URN)10.3109/03091902.2015.1021430 (DOI)25762203 (PubMedID)2-s2.0-84926353218 (Scopus ID)fe957028-5257-40a6-a492-377ef3d2879a (Local ID)fe957028-5257-40a6-a492-377ef3d2879a (Archive number)fe957028-5257-40a6-a492-377ef3d2879a (OAI)
Note
Validerad; 2015; Nivå 2; 20150316 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Åstrand, A. P., Jalkanen, V., Andersson, B. M. & Lindahl, O. (2014). Detection of stiff nodules embedded in soft tissue phantoms, mimicking cancer tumours, using a tactile resonance sensor (ed.). Paper presented at . Journal of Biomedical Science and Engineering, 7(4), 181-193
Open this publication in new window or tab >>Detection of stiff nodules embedded in soft tissue phantoms, mimicking cancer tumours, using a tactile resonance sensor
2014 (English)In: Journal of Biomedical Science and Engineering, ISSN 1937-6871, E-ISSN 1937-688X, Vol. 7, no 4, p. 181-193Article in journal (Refereed) Published
Abstract [en]

Background: Prostate cancer (PCa) is the most common form of cancer among males in Europe and in the USA and the most common curative treatment is removal of the prostate, i.e. prostatectomy. After the removal, the prostate is histopathologically analysed. One area of interest is to examine the perifery of the prostate, as tumours on and near the surface can indicate that the PCa has spread to other parts of the body. There are no current methods to examine the surface of the prostate at the time of surgery. Tactile resonance sensors can be used for detecting areas of different stiffness in soft tissue. Human prostate tissue affected by cancer is usually stiffer than healthy tissue, and for this purpose, a tactile resonance sensor was developed. The aim of this study was to investigate the depth at which embedded stiffer volumes could be detected, using soft tissue phantoms. Methods: With the tactile resonance sensor used in this study, the shift of the resonance frequency and the force at contact with tissue can be measured, and combined into a tissue stiffness parameter. The detection sensitivity of the sensor at impression depths, 0.4 and 0.8 mm, was measured for detection of inserted nodules of stiff silicone in softer silicone and in chicken muscle tissue, mimicking prostate tissue with cancer tumours. Results: Measurements on the silicone samples detected the hidden stiffer object at a depth of 1 - 4 mm with a difference in the stiffness parameter of 80 - 900 mN/kHz (p < 0.028, n = 48). At the depth 5 - 6 mm the difference was smaller but still significant < 30 mN/kHz (p < 0.05, n = 24). For the measurements on chicken muscle, the detectable depth was 4 mm (p < 0.05, n = 24). Conclusion: This model study suggests that, with only a small impression depth of ≤1 mm, the resonance sensor system described here can detect stiffness variations located at least 4 mm in silicone and chicken muscle, mimicking tumours in prostate tissue.

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-15900 (URN)10.4236/jbise.2014.74022 (DOI)f77bb2c7-5b1f-4081-812e-5534c2b2f377 (Local ID)f77bb2c7-5b1f-4081-812e-5534c2b2f377 (Archive number)f77bb2c7-5b1f-4081-812e-5534c2b2f377 (OAI)
Note
Validerad; 2014; 20140404 (olofl)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Lindahl, O., Nyberg, M., Jalkanen, V. & Ramser, K. (2014). Erratum: Prostate cancer detection using a combination of Raman spectroscopy and stiffness sensing (ed.). In: (Ed.), Fong-Chin Su; Shyh-Hau Wang; Ming-Long Yeh (Ed.), 1st Global Conference on Biomedical Engineering & 9th Asian-Pacific Conference on Medical and Biological Engineering: October 9-12, 2014, Tainan, Taiwan. Paper presented at Global Conference on Biomedical Engineering : 09/10/2014 - 12/10/2014 (pp. e1). New York: Encyclopedia of Global Archaeology/Springer Verlag
Open this publication in new window or tab >>Erratum: Prostate cancer detection using a combination of Raman spectroscopy and stiffness sensing
2014 (English)In: 1st Global Conference on Biomedical Engineering & 9th Asian-Pacific Conference on Medical and Biological Engineering: October 9-12, 2014, Tainan, Taiwan / [ed] Fong-Chin Su; Shyh-Hau Wang; Ming-Long Yeh, New York: Encyclopedia of Global Archaeology/Springer Verlag, 2014, p. e1-Conference paper, Published paper (Refereed)
Abstract [en]

IFMBE Proceedings Vol. 47: ”1st Global Conference on Biomedical Engineering & 9th Asian-Pacific Conference on Medical and Biological Engineering” missed the contribution ”Prostate cancer detection using a combination of Raman spectroscopy and stiffness sensing” written by Olof Lindahl for technical reasons. The editors apologize for the mistake.

Place, publisher, year, edition, pages
New York: Encyclopedia of Global Archaeology/Springer Verlag, 2014
Series
International Federation for Medical and Biological Engineering Proceedings, ISSN 1680-0737 ; 47
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-37199 (URN)10.1007/978-3-319-12262-5_75 (DOI)b25fc867-0f56-4a36-a3ba-07da29e46464 (Local ID)978-3-319-12262-5 (ISBN)978-3-319-12262-5 (ISBN)b25fc867-0f56-4a36-a3ba-07da29e46464 (Archive number)b25fc867-0f56-4a36-a3ba-07da29e46464 (OAI)
Conference
Global Conference on Biomedical Engineering : 09/10/2014 - 12/10/2014
Note
Godkänd; 2014; 20150114 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Jansson, U., Lindahl, O. & Andersson, B. M. (2014). Modeling the High-Frequency Complex Modulus of a Silicone Rubber Using Standing Lamb waves and an Inverse FEM Method (ed.). Paper presented at . IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 61(12), 2106-2120
Open this publication in new window or tab >>Modeling the High-Frequency Complex Modulus of a Silicone Rubber Using Standing Lamb waves and an Inverse FEM Method
2014 (English)In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, ISSN 0885-3010, E-ISSN 1525-8955, Vol. 61, no 12, p. 2106-2120Article in journal (Refereed) Published
Abstract [en]

To gain an understanding of the high-frequency elastic properties of silicone rubber, a finite element model of a cylindrical piezoelectric element, in contact with a silicone rubber disk, was constructed. The frequency-dependent elastic modulus of the silicone rubber was modeled by a fourparameter fractional derivative viscoelastic model in the 100 to 250 kHz frequency range. The calculations were carried out in the range of the first radial resonance frequency of the sensor. At the resonance, the hyperelastic effect of the silicone rubber was modeled by a hyperelastic compensating function. The calculated response was matched to the measured response by using the transitional peaks in the impedance spectrum that originates from the switching of standing Lamb wave modes in the silicone rubber. To validate the results, the impedance responses of three 5-mm-thick silicone rubber disks, with different radial lengths, were measured. The calculated and measured transitional frequencies have been compared in detail. The comparison showed very good agreement, with average relative differences of 0.7%, 0.6%, and 0.7% for the silicone rubber samples with radial lengths of 38.0, 21.4, and 11.0 mm, respectively. The average complex elastic moduli of the samples were (0.97 + 0.009i) GPa at 100 kHz and (0.97 + 0.005i) GPa at 250 kHz.

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-5507 (URN)10.1109/TUFFC.2014.006471 (DOI)000345944300017 ()2-s2.0-84917736427 (Scopus ID)3a031510-d325-45cc-8336-df0c6f24733d (Local ID)3a031510-d325-45cc-8336-df0c6f24733d (Archive number)3a031510-d325-45cc-8336-df0c6f24733d (OAI)
Note
Validerad; 2014; 20140901 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Lindahl, O., Nyberg, M., Jalkanen, V. & Ramser, K. (2014). Prostate cancer detection using a combination of Raman spectroscopy and stiffness sensing (ed.). In: (Ed.), Fong-Chin Su; Shyh-Hau Wang; Ming-Long Yeh (Ed.), 1st Global Conference on Biomedical Engineering & 9th Asian-Pacific Conference on Medical and Biological Engineering: October 9-12, 2014, Tainan, Taiwan. Paper presented at Global Conference on Biomedical Engineering : 09/10/2014 - 12/10/2014 (pp. 267-270). New York: Encyclopedia of Global Archaeology/Springer Verlag
Open this publication in new window or tab >>Prostate cancer detection using a combination of Raman spectroscopy and stiffness sensing
2014 (English)In: 1st Global Conference on Biomedical Engineering & 9th Asian-Pacific Conference on Medical and Biological Engineering: October 9-12, 2014, Tainan, Taiwan / [ed] Fong-Chin Su; Shyh-Hau Wang; Ming-Long Yeh, New York: Encyclopedia of Global Archaeology/Springer Verlag, 2014, p. 267-270Conference paper, Published paper (Refereed)
Abstract [en]

Prostate cancer (PCa) is the most common cancer form for men in Europe. A sensor system combining Raman spectroscopy and stiffness sensing with a resonance sensor has recently been developed by us for prostate cancer detection. In this study the sensor system has been used for measurements on two slices of fresh human prostate tissue. The stiffness sensor could detect locations slices with significantly different stiffness contrasts (p < 0.05). Raman spectroscopic measurements could be performed with the dual-modality probe for tissue classification. The findings are important for the continued development of a combination probe for prostate cancer detection

Place, publisher, year, edition, pages
New York: Encyclopedia of Global Archaeology/Springer Verlag, 2014
Series
International Federation for Medical and Biological Engineering Proceedings, ISSN 1680-0737 ; 47
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-40175 (URN)10.1007/978-3-319-12262-5 (DOI)f321d7ae-a17f-459a-9a14-a32f492b51a2 (Local ID)978-3-319-12262-5 (ISBN)978-3-319-12262-5 (ISBN)f321d7ae-a17f-459a-9a14-a32f492b51a2 (Archive number)f321d7ae-a17f-459a-9a14-a32f492b51a2 (OAI)
Conference
Global Conference on Biomedical Engineering : 09/10/2014 - 12/10/2014
Note
Godkänd; 2014; 20141029 (ramser)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Lindahl, O., Andersson, B., Lundström, R. & Ramser, K. (2013). Biomedical engineering research improves the health care industry (ed.). In: (Ed.), Laura M. Roa Romero (Ed.), XIII Mediterranean conference on medical and biological engineering and computing: MEDICON 2013, 25-28 September 2013, Seville, Spain. Paper presented at Mediterranean Conference on Medical and Biological Engineering and Computing : 25/09/2013 - 28/09/2013 (pp. 1124-1126). Wien: Encyclopedia of Global Archaeology/Springer Verlag, VIII
Open this publication in new window or tab >>Biomedical engineering research improves the health care industry
2013 (English)In: XIII Mediterranean conference on medical and biological engineering and computing: MEDICON 2013, 25-28 September 2013, Seville, Spain / [ed] Laura M. Roa Romero, Wien: Encyclopedia of Global Archaeology/Springer Verlag, 2013, Vol. VIII, p. 1124-1126Conference paper, Published paper (Refereed)
Abstract [en]

The health care industry is dependent on new innovations for its survival and expansion. Health care innovations are also important for improving patient care. Through activities at the centre for biomedical engineering and physics (CMTF) we have generated growth both in academia at the universities and in the industry in northern Sweden. Fruitful cooperation was generated between 26 research projects and about 15 established companies in the field of biomedical engineering. The established researcher-owned company for business development of the research results from the CMTF, CMTF Business Development Co Ltd, has so far launched three spin-off companies and has 10 new business leads to develop. The activities have also increased the interest for commercialization and entrepreneurship among the scientists in the centre. So far a total of nine spin-off companies have resulted from the CMTF-research since the year 2000 that has improved the health care market in northern Sweden

Place, publisher, year, edition, pages
Wien: Encyclopedia of Global Archaeology/Springer Verlag, 2013
Series
International Federation for Medical and Biological Engineering Proceedings (IFMBE Proceedings), ISSN 1680-0737 ; 41
National Category
Other Medical Engineering
Research subject
Medical Engineering for Healthcare
Identifiers
urn:nbn:se:ltu:diva-39079 (URN)10.1007/978-3-319-00846-2_278 (DOI)2-s2.0-84891290695 (Scopus ID)db01fc61-ef61-487e-9517-4872f8e9a56f (Local ID)978-3-319-00845-5 (ISBN)978-3-319-00846-2 (ISBN)db01fc61-ef61-487e-9517-4872f8e9a56f (Archive number)db01fc61-ef61-487e-9517-4872f8e9a56f (OAI)
Conference
Mediterranean Conference on Medical and Biological Engineering and Computing : 25/09/2013 - 28/09/2013
Note
Validerad; 2013; 20131024 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Ramser, K., Alrifaiy, A. & Lindahl, O. (2013). Ett multifunktionelt mätsystem som kan efterlikna förhållanden under en stroke: hur försvarar sig neuroner mot akut syrebrist? (ed.). Paper presented at Medicinteknikerdagarna : 01/10/2013 - 02/10/2013. Paper presented at Medicinteknikerdagarna : 01/10/2013 - 02/10/2013.
Open this publication in new window or tab >>Ett multifunktionelt mätsystem som kan efterlikna förhållanden under en stroke: hur försvarar sig neuroner mot akut syrebrist?
2013 (Swedish)Conference paper, Oral presentation only (Other academic)
Abstract [sv]

På senare tid har aktuell forskning gett inblick i hur vår kropp fungerar på den biokemiska nivån. Det har lett till nya terapeutiska strategier för att förhindra eller bota neurologiska sjukdomar såsom hjärncancer, stroke, Alzheimers och Parkinsons. Framstegen beror till stor grad på utvecklandet av mätmetoder som ger kunskap om hur små organismer beter sig på den biomolekylära nivån. Vår tvärvetenskapliga forskning är inriktad på att utveckla metoder för att undersöka hur levande biologiska neuroner eller hjärnvävnad försvarar sig mot syrebrist eller andra stressituationer. Vi har inriktat oss på hemoproteiner då det nyligen har visat sig att de kan förhindra skador som uppstår vid syrebrist. Vi sammankopplar ett flertal mätmetoder och ett mikroflödessystem under ett mikroskop för att undersöka hemoproteiners verkan på enstaka neuroner i nära fysiologiska miljöer, det vill säga så likt det levande som möjligt. Det har visat sig vara viktigt att kunna studera nervcellernas elektriska signaler som är ett mått på stressnivån samtidigt som man mäter hur hemoproteiner samverkar med olika molekyler och proteiner. De elektriska signaleringsegenskaperna hos nervceller eller tunna hjärnsnitt mäts lämpligen genom patch-clamp teknik. Optisk Raman spektroskopi och UV-Vis spektroskopi fungerar väl för att studera haemoproteiner och de första Ramanmätningarna på tunna hjärnskivor visade att det går att skilja åt olika hemoproteiner. För att kunna kontrollera syrehalten krävs det en sluten gastät flödeskammare med möjlighet till patch-clamp där man snabbt kan flöda olika lösningar av varierande syre-, och salthalt. I detta system är patch-clamp pipetten fixerad till en position och cellerna förs till pipetten med hjälp av en optisk pincett som är en beröringsfri optisk manipuleringsmetod där biologiska celler fångas i ett starkt fokuserat laserljus som här förflyttas med hjälp av ett xyz-bord. Vi kommer att presentera de senaste framstegen i utvecklandet av mätsystemet där röda blodceller användes som modell.

National Category
Other Medical Engineering
Research subject
Medical Engineering for Healthcare
Identifiers
urn:nbn:se:ltu:diva-28036 (URN)1af58122-2fd4-4240-82cb-dcc11de14c73 (Local ID)1af58122-2fd4-4240-82cb-dcc11de14c73 (Archive number)1af58122-2fd4-4240-82cb-dcc11de14c73 (OAI)
Conference
Medicinteknikerdagarna : 01/10/2013 - 02/10/2013
Note
Godkänd; 2013; 20131203 (ramser)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Nyberg, M., Ramser, K. & Lindahl, O. (2013). Optical fibre probe NIR Raman measurements in ambient light and in combination with a tactile resonance sensor for possible cancer detection (ed.). Paper presented at . The Analyst, 138(14), 4029-4034
Open this publication in new window or tab >>Optical fibre probe NIR Raman measurements in ambient light and in combination with a tactile resonance sensor for possible cancer detection
2013 (English)In: The Analyst, ISSN 0003-2654, E-ISSN 1364-5528, Vol. 138, no 14, p. 4029-4034Article in journal (Refereed) Published
National Category
Other Medical Engineering
Research subject
Medical Engineering for Healthcare
Identifiers
urn:nbn:se:ltu:diva-11781 (URN)10.1039/c3an00243h (DOI)000320466200021 ()23720764 (PubMedID)2-s2.0-84891718379 (Scopus ID)acc299d1-5754-484b-b8b3-75adf4b3f5e9 (Local ID)acc299d1-5754-484b-b8b3-75adf4b3f5e9 (Archive number)acc299d1-5754-484b-b8b3-75adf4b3f5e9 (OAI)
Note
Validerad; 2013; 20130531 (mornyb)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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