1. L. van Bodegom-Vos, MSc, PhD, Department of Medical Decision Making, Leiden University Medical Center, J10-S, PO Box 9600, 2300 RC Leiden, the Netherlands.
2. J. Verhoef, PT, PhD, Department of Physical Therapy, Faculty of Health, University of Applied Sciences, Leiden, the Netherlands, and Department of Physiotherapy, Leiden University Medical Center, Leiden, the Netherlands.
3. M. Dickmann, PT, MPT, Department of Physical Therapy, Faculty of Health, University of Applied Sciences, and Institute of Physical Therapy, Sport Medisch Centrum Oegstgeest, Oegstgeest, the Netherlands.
4. M. Kleijn, PT, MPT, Department of Physical Therapy, Faculty of Health, University of Applied Sciences, and Department of Rehabilitation, Academic Medical Center, Amsterdam, the Netherlands.
5. I. van Vliet, PT, MPT, Department of Physical Therapy, Faculty of Health, University of Applied Sciences, and Institute of Physical Therapy, Ommedijk, Leiderdorp, the Netherlands.
6. E. Hurkmans, PT, MSc, PhD, Department of Rheumatology, Leiden University Medical Center.
7. P. van der Wees, PT, MSc, PhD, Royal Dutch Society for Physical Therapy, Amersfoort, the Netherlands; Scientific Institute for Quality of Healthcare, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands; CAPHRI School for Public Health and Primary Care, Maastricht University, Maastricht, the Netherlands; and Department of Health Care Policy, Harvard Medical School, Boston, Massac
8. T. Vliet Vlieland, PT, MD, PhD, Department of Rheumatology, Leiden University Medical Center, and Department of Orthopaedics, Leiden University Medical Center.