1. Health Care Center Haarlemmermeer, Hoofddorp, the Netherlands
2. Department of General Practice, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands
3. Arthritis Research UK Primary Care Centre, Keele University, UK
4. Department of Rehabilitation Medicine and Department of Psychiatry, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands