Anal human papillomavirus genotype diversity and co-infection in a community-based sample of homosexual men
C M Vajdic, M T van Leeuwen, F Jin, G Prestage, G Medley, R J Hillman, M P Stevens, L P Botes, I Zablotska, S N Tabrizi, A E Grulich
Sexually Transmitted Infections Sep 2009, 85 (5) 330-335; DOI: 10.1136/sti.2008.034744