RT Journal Article SR Electronic T1 Sexual co-transmission of HIV, hepatitis B, and hepatitis C viruses JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 317 OP 317 DO 10.1136/sti.76.4.317 VO 76 IS 4 A1 Sirisha Singh A1 D M Thappa A1 T J Jaisankar A1 S Sujatha YR 2000 UL http://sti.bmj.com/content/76/4/317.abstract AB