Nunn, A; McCormack, S; Crook, AM; Pool, R; Rutterford, C; Hayes, R; (2009) Microbicides Development Programme: design of a phase III trial to measure the efficacy of the vaginal microbicide PRO 2000/5 for HIV prevention. Trials , 10 , Article 99. 10.1186/1745-6215-10-99.