1. Musculoskeletal Research Programme, Division of Applied Medicine, University of Aberdeen, Foresterhill, Aberdeen, 2Primary Care Rheumatology Society, Northallerton, 3Arthritis Research UK, Chesterfield, UK, 4Merck, Women's Health and Endocrine, North Wales PA, USA and 5Aberdeen Pain Research Collaboration (Epidemiology Group), Institute of Applied Health Sciences, University of Aberdeen, Forester