1. Ergologie; Krakelingweg 73 Zeist Netherlands 3707 HS
2. VU University Medical Center, Amsterdam; Department of Rehabilitation Medicine, Institute for Research in Extramural Medicine (EMGO); PO Box 7057 Amsterdam Netherlands 1007 MB
3. Executive Board of VU University Amsterdam; De Boelelaan 1105, Room 2d-18 Amsterdam Netherlands 1081 HV
4. Nivel; P.O.Box 1568 Utrecht Netherlands 3500 BN
5. Sint Maartenskliniek; Department of Rheumatology; Hengstdal 3 Nijmegen Netherlands 6522 JV
6. University of Professional Education Amsterdam; School of Occupational Therapy; PO Box 12146 Amsterdam Netherlands