1. K.S. Dziedzic, PhD, is Senior Lecturer in Physiotherapy, Arthritis Research Campaign National Primary Care Centre, Primary Care Sciences, Keele University, Keele, Staffordshire ST5 5BG, United Kingdom.
2. J.C. Hill, PhD, is Lecturer in Physiotherapy, Arthritis Research Campaign National Primary Care Centre, Primary Care Sciences, Keele University.
3. M. Porcheret, MBBS, MPhil, is GP Research Fellow, Arthritis Research Campaign National Primary Care Centre, Primary Care Sciences, Keele University.
4. P.R. Croft, MD, is Professor of Primary Care Epidemiology, Arthritis Research Campaign National Primary Care Centre, Primary Care Sciences, Keele University.