HIV incidence in a multinational cohort of men and transgender women who have sex with men in sub-Saharan Africa: Findings from HPTN 075 by Sandfort, TGM, Mbilizi, Y, Sanders, EJ, Guo, X, Cummings, V, Hamilton, EL, Akelo, V, Panchia, R, Dominguez, K, Stirratt, MJ, Chege, W, Lucas, J, Gaydos, CA, Chen, YQ, Eshleman, SH