A cognitive behavioural intervention to reduce sexually transmitted infections among gay men: randomised trial
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Anne M Johnson | A. Copas | J. Stephenson | J. Imrie | F. Cowan | A. Billington | S. Wanigaratne | L. French | P. French | A. Johnson | Andrew J Copas | John Imrie | Judith Stephenson | Frances M Cowan | Andrew J P Billington | Lesley French | Patrick D French | Anne M Johnson | A. Copas | J. Stephenson