John Imrie, Judith M Stephenson, Frances M Cowan, Shamil Wanigaratne, Andrew J P Billington, Andrew J Copas et al
Imrie J, Stephenson J M, Cowan F M, Wanigaratne S, Billington A J P, Copas A J et al.
A cognitive behavioural intervention to reduce sexually transmitted infections among gay men: randomised trial
BMJ 2001; 322 :1451
doi:10.1136/bmj.322.7300.1451