Syphilis infection among homosexual men reporting contact with syphilis: a case control study
Ajith P Weerakoon, Christopher K Fairley, Tim RH Read, Catriona Bradshaw, Catherine Forrester, Melanie Bissessor, Ian Denham, Marcus Y Chen
BMJ Open Jan 2012, 2 (4) e001339; DOI: 10.1136/bmjopen-2012-001339