1. Pulvertaft Hand Centre, Kings Treatment Centre, Royal Derby Hospital, Uttoxeter Road, Derby DE22 3NE, UK
2. Department of Rheumatology, Royal Derby Hospital, Uttoxeter Road, Derby DE22 3NE, UK
3. A. Alfred Taubman Health Care Center, University of Michigan Health System, 1500 East Medical Center Drive, Ann Arbor, MI 48109, USA
4. Curtis National Hand Center, Union Memorial Hospital, Johnston Professional Building, 2nd Floor, 3333 North Calvert Street, Baltimore, MD 21218 , USA