Effect of T4 count and cofactors on the incidence of AIDS in homosexual men infected with human immunodeficiency virus - Goedert, J J; Biggar, R J; Melbye, M; Mann, D L; Wilson, S; Gail, M H; Grossman, R J; DiGioia, R A; Sanchez, W C; Weiss, S H; Blattner, W A (JAMA, 1987)