Risk of acute nonlymphocytic leukemia and preleukemia in patients treated with cyclophosphamide for non-Hodgkin's lymphomas. Comparison with results obtained in patients treated for Hodgkin's disease and ovarian carcinoma with other alkylating agents. - Pedersen-Bjergaard,J.; Ersboll,J.; Sorensen,H.M.; Keiding,N.; Larsen,S.O.; Philip,P. (Ann Intern Med, 1985)