1. Mapi Values, Houten, The Netherlands
2. Health Economic Statistics, Merck Research Laboratories, Merck & Co., Inc., Blue Bell, Pennsylvania, USA
3. Sir Alfred Baring Garrod Clinical Trials Unit, Academic Department of Rheumatology, GKT School of Medicine, King's College Hospital, London, UK
4. Department of Rheumatology, Addenbrooke's Hospital, Cambridge, UK
5. Department of Rheumatology, Royal National Orthopaedic Hospital, Stanmore and Barnet Hospital, UK
6. Department of Rheumatology, Division of Immunity and Infection, University of Birmingham, Birmingham, UK
7. Outcome Research, Merck & Co., Inc., Whitehouse Station, New Jersey, USA