[1] Univ Michigan, Dept Internal Med, Ann Arbor, MI 48109 USA
[2] Hop Antoine Beclere, Dept Resp Med, Clamart, France
[3] Royal Free & Univ Coll Med Sch, Cardiol Unit, London WC1E 6BT, England
[4] Univ Queensland, Sunshine Coast Queensland Dept Med, Rheumatol Res Unit, Brisbane, Qld 4072, Australia
[5] Georgetown Univ, Dept Med, Washington, DC USA