1. Academic Medical Center; Department of Orthopaedic Surgery; Meibergdreef 9 P.O. Box 22660 Amsterdam Netherlands 1100 DD
2. Keele University; Department of Primary Care & Health Sciences; Keele Staffordshire UK ST5 5BG
3. Department General Practice; Academic Medical Center; J3 - 354 Box 22700 Amsterdam Netherlands 1100 DE
4. University Medical Center Utrecht (STR 6.131); Julius Center for Health Sciences and Primary Care; PO Box 85500 Utrecht Netherlands 3508 GA
5. VU University Medical Center; Executive Board; PO Box 7057 Room 2d-18 Amsterdam Netherlands 1007 MB