[1] Vadstena Primary Health Care Center, SE-592-32 Vadstena
[2] Division of Social Medicine and Public Health Science, Department of Health and Society, Linköping University, Linköping
[3] Center for Public Health Sciences, Department of Health and Society, Linköping University, Linköping
[4] Division of Orthopedics, Sahlgrenska University Hospital, Mölndal