The safety and efficacy of zidovudine (AZT) in the treatment of subjects with mildly symptomatic human immunodeficiency virus type 1 (HIV) infection. A double-blind, placebo-controlled trial. The AIDS Clinical Trials Group. - Fischl, M A; Richman, D D; Hansen, N; Collier, A C; Carey, J T; Para, M F; Hardy, W D; Dolin, R; Powderly, W G; Allan, J D (Annals of Internal Medicine, 1990)