Stoll T, Sutcliffe N, Mach J, Klaghofer R, Isenberg DA. Analysis of the relationship between disease activity and damage in patients with systemic lupus erythematosus--a 5-yr prospective study. Rheumatology (Oxford). 2004 Aug;43(8):1039–44. doi: 10.1093/rheumatology/keh238. PMID: 15161983.