RT Journal Article SR Electronic T1 How common are sexually transmitted infections in the elderly? JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 379 OP 379 DO 10.1136/sti.74.5.379-a VO 74 IS 5 A1 R D Cranston A1 R N Thin YR 1998 UL http://sti.bmj.com/content/74/5/379.1.abstract