Backhaus M, Burmester G R, Gerber T, Grassi W, Machold K P, Swen W A, Wakefield R J, Manger B
Department of Rheumatology and Clinical Immunology, Charité University Hospital, Humboldt University, Berlin, Germany.
Ann Rheum Dis. 2001 Jul;60(7):641-9. doi: 10.1136/ard.60.7.641.