Sexual behaviour, recreational drug use and hepatitis C co-infection in HIV-diagnosed men who have sex with men in the United Kingdom: results from the ASTRA study. - Daskalopoulou, Marina; Rodger, Alison; Thornton, Alicia; Phillips, Andrew; Sherr, Lorraine; Gilson, Richard; Johnson, Margaret; Fisher, Martin; Anderson, Jane; McDonnell, Jeffrey; Edwards, Simon; Perry, Nicky; et al. (Journal of the International AIDS Society, 2014)