AIDS. 2000 Sep 8;14(13):2051-3.
Viagra use and sexual risk behaviour among gay men in London.
Sherr L, Bolding G, Maguire M, Elford J.
Department of Primary Care and Population Sciences and Royal Free Centre for HIV Medicine, Royal Free and University College Medical School, University College London, UK.
PMID: 10997413 [PubMed - indexed for MEDLINE]