1. The San Francisco men's health study. III. Reduction in human immunodeficiency virus transmission among homosexual-bisexual men;Winkelstein, W.; Samuel, M.; Padian, N.S.; Wiley, J.A.; Lang, W.; Anderson, R.E.;AmJsPublic Health,1982
2. Evidence for recent changes in sexual behaviour in homosexual men in England and Wales;Johnson, A.M.; Gill, O.N.;Philos Trans R Soc Lond [Biol],1989
3. Changes in sexual behaviour and incidence of gonorrhoea;Lawrence, A.G.; Singaratnam, A.E.;Lancet,1987
4. Trends in gonorrhea in homosexually active men, King County;Handsfield, H.H.; Krekeler, B.; Nicola, R.M.;Washington,1989
5. Increase in unsafe homosexual behaviour;den Hoek JAR, Van; van Griensven GJP; RA, Coutinho;Lancet,1990