Azathioprine/methylprednisolone versus cyclophosphamide in proliferative lupus nephritis. A randomized controlled trial

Grootscholten C, Ligtenberg G, Hagen EC, van den Wall Bake AW, de Glas-Vos JW, Bijl M, Assmann KJ, Bruijn JA, Weening JJ, van Houwelingen HC, Derksen RH, Berden JH; Dutch Working Party on Systemic Lupus Erythematosus