Bjordal Jan M, Chow Roberta T, Lopes-Martins Rodrigo A B, Johnson Mark I
Physiotherapy Research Group, Department of Global Public Health and Primary Care, University of Bergen, Kalfarveien 31, 5018, Bergen, Norway,
Rheumatol Int. 2014 Aug;34(8):1181-3. doi: 10.1007/s00296-013-2940-8. Epub 2014 Jan 9.