Retention of a cohort of men who have sex with men and transgender women at risk for and living with HIV in Abuja and Lagos, Nigeria: a longitudinal analysis. - Kayode, Blessing O; Mitchell, Andrew; Ndembi, Nicaise; Kokogho, Afoke; Ramadhani, Habib O; Adebajo, Sylvia; Robb, Merlin L; Baral, Stefan D; Ake, Julie A; Charurat, Manhattan E; Crowell, Trevor A; Nowak, Rebecca G; et al. (Journal of the International AIDS Society, 2020)