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. Vrije Universiteit; Executive Board of V U University; De Boelelaan 1105, Room 2d-18 Amsterdam Netherlands 1081 BT
4. Jan van Bremen Instituut; Dr. Jan van Bremenstraat 2 Amsterdam Netherlands 1056 AB
5. University of Professional education Arnhem Nijmegen; School of Occupational therapy; P.O. Box 6960 Nijmegen Netherlands 6503 GL
6. Sint Maartenskliniek; Department of Rheumatology; Hengstdal 3 Nijmegen Netherlands 6522 JV