Affiliation: | (1) Department of Rheumatology, St Bartholomew's Hospital, UK;(2) Department of Reproductive Physiology, St Bartholomew's Hospital, UK;(3) Department of Immunology, The London Hospital, London E1, UK;(4) Department of Rheumatology, The London Hospital, London E1, UK;(5) Department of Epidemiology, The London Hospital, London E1, UK;(6) Bone and Joint Research Unit, The London Hospital, Ashfield St, London E1, UK |