PT - JOURNAL ARTICLE AU - S O Aral TI - Sexual risk behaviour and infection: epidemiological considerations AID - 10.1136/sti.2004.011866 DP - 2004 Dec 01 TA - Sexually Transmitted Infections PG - ii8--ii12 VI - 80 IP - suppl 2 4099 - http://sti.bmj.com/content/80/suppl_2/ii8.short 4100 - http://sti.bmj.com/content/80/suppl_2/ii8.full SO - Sex Transm Infect2004 Dec 01; 80