IV-CY-L=intravenous cyclophosphamide long course; IV-CY-S=intravenous cyclophosphamide short course; NIH=National Institutes of Health.Reproduced from The Lancet Vol. 340. Boumpas DT et al. Controlled Trial of Pulse Methylprednisolone Versus Two Regimens of Pulse Cyclophosphamide in Severe Lupus Nephritis, 741–5, Copyright 1992, with permission from Elsevier.