Reference:
Llewellyn C, Abraham C, Miners A, Smith H, Pollard A, Benn P, Fisher M. Multicentre RCT and economic evaluation of a psychological intervention together with a leaflet to reduce risk behaviour amongst men who have sex with men (MSM) prescribed post-exposure prophylaxis for HIV following sexual exposure (PEPSE): A protocol. BMC Infectious Diseases 2012;12: 70.