Affiliation: | 1. Utrecht University, Department of Clinical and Health Psychology, Heidelberglaan 1, 3584CS Utrecht, The Netherlands;2. Health Services Research, School of Health Sciences, City University London, College Building, Northampton Square, London EC1 V 0HB, UK;3. Sint Maartenskliniek, Department of Rheumatology, Hengstdal 3, 6574NA Ubbergen (bij Nijmegen), The Netherlands |