1. Department of Internal Medicine, Division of Endocrinology, Central Finland Central Hospital, Jyväskylä, Finland
2. Health Centre of Jyväskylä Cooperation, Jyväskylä, Finland
3. Department of Radiology, Helsinki University Central Hospital, Helsinki, Finland
4. Service Systems Research Unit, National Institute for Health and Welfare, Helsinki, Finland
5. Bone and Cartilage Research Unit, University of Eastern Finland, Kuopio, Finland
6. Centre for Research Methods, Department of Social Research, University of Helsinki, Helsinki, Finland