Evaluating interventions to reduce behaviour associated with HCV reinfection in men who have sex with men: study protocol for a non-blinded, phase 2, randomised trial Por Kris Hage, Anders Boyd, Udi Davidovich, Paul Zantkuijl, Elske Hoornenborg, Amy Matser, Ellen Generaal, Janke Schinkel, Eve Todesco, Marc van der Valk, Hayette Rougier, Karine Lacombe, Maria Prins, on behalf of the ICECREAM study group