1. School of Medicine; University of Tampere; Tampere Finland
2. The National Institute of Health and Welfare; Helsinki; Finland
3. Department of Orthopaedics and Traumatology; Kuopio University Hospital; Kuopio Finland
4. Bone and Cartilage Research Unit, Institute of Clinical Medicine; University of Eastern Finland; Kuopio Finland
5. Tampere Centre for Child Health Research; University of Tampere and Tampere University Hospital; Tampere Finland
6. Department of Internal Medicine; Tampere University Hospital; Tampere Finland
7. Department of Internal Medicine; Seinäjoki Central Hospital; Seinäjoki Finland