Anal intercourse as a possible factor in heterosexual transmission of HTLV-III to spouses of hemophiliacs - Melbye, M; Ingerslev, J; Biggar, R J; Alexander, S; Sarin, P S; Goedert, J J; Zachariae, E; Ebbesen, P; Stenbjerg, S (N Engl J Med, 1985)