Performance of HIV pre-exposure prophylaxis indirect adherence measures among men who have sex with men and transgender women: Results from the PrEP Brasil Study - Marins, Luana M. S; Torres, Thiago S; Leite, Iuri da C; Moreira, Ronaldo I; Luz, Paula M; Hoagland, Brenda; Kallas, Esper Georges; Madruga, Jose Valdez; Liu, Albert Y; Anderson, Peter L (PLOS ONE, 2019)