1. VU University Amsterdam; Department of Health Sciences, Faculty of Earth and Life Sciences; Amsterdam Netherlands
2. VU University Amsterdam; Department of Health Sciences, EMGO+ Institute for Health and Care Research; PO Box 7057 Amsterdam Netherlands 1007 MB
3. Dextra Medical Center; Raumantie 1 a Helsinki Finland FIN-00350
4. Duodecim Medical Publications Ltd.; PO Box 874 Helsinki Finland 00101
5. Kuntoutus ORTON; Rehabilitation Centre; Tenholantie 10 Helsinki Finland FIN-00280
6. National Institute for Health and Welfare (THL); Centre for Health and Social Economics (CHESS); PO Box 30 Mannerheimintie 166 Helsinki Finland FI-00271