A randomised study of rituximab and belimumab sequential therapy in PR3 ANCA-associated vasculitis (COMBIVAS): design of the study protocol oleh Mark E. McClure, Seerapani Gopaluni, James Wason, Robert B. Henderson, Andre Van Maurik, Caroline C.O. Savage, Charles D. Pusey, Alan D. Salama, Paul A. Lyons, Jacinta Lee, Kim Mynard, David R. Jayne, Rachel B. Jones, on behalf the COMBIVAS investigators