[1] Macclesfield Hosp, Dept Med, Macclesfield, Cheshire, England
[2] Whipps Cross Univ Hosp, Rapid Access Chest Pain Clin, London E11 1NR, England
[3] Leicester Royal Infirm, Dept Med, Leicester, Leics, England
[4] Whipps Cross Univ Hosp, Dept Rheumatol, London E11 1NR, England