From the *ARC Epidemiology Unit, University of Manchester Medical School, Manchester;
the †Department of Rheumatology, Tameside Acute Trust, Ashton-under-Lyne, Greater Manchester; and
the ‡Department of Public Health Medicine, West Pennine Health Authority, Oldham, Greater Manchester, United Kingdom.
Acknowledgement date: May 21, 2002.
First revision date: August 29, 2002.
Acceptance date: September 19, 2002.
Supported by the Arthritis Research Campaign and the West Pennine Health Authority.
The submitted manuscript does not contain information about medical devices or drugs.
Institutional and foundation funds were received in support of this work. No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.
Address correspondence to Professor Deborah Symmons, ARC Epidemiology Unit, University of Manchester Medical School, 2nd Floor, Stopford Building, Oxford Road, Manchester M13 9PT, United Kingdom; E-mail: [email protected]