Annals of the Rheumatic Diseases, 73(2), 455-61. BMJ Publishing Group Annals of the Rheumatic Diseases, 73(2), 455-461. BMJ Publishing Group Annals of the Rheumatic Diseases, 73(2), 455-461. BMJ PUBLISHING GROUP Annals of the Rheumatic Diseases, 73, 2, pp. 455-61 Annals of the Rheumatic Diseases, 73, 455-61