Concomitant socioeconomic, behavioral, and biological factors associated with the disproportionate HIV infection burden among Black men who have sex with men in 6 U.S. cities. oleh Kenneth H Mayer, Lei Wang, Beryl Koblin, Sharon Mannheimer, Manya Magnus, Carlos del Rio, Susan Buchbinder, Leo Wilton, Vanessa Cummings, Christopher C Watson, Estelle Piwowar-Manning, Charlotte Gaydos, Susan H Eshleman, William Clarke, Ting-Yuan Liu, Cherry Mao, Samuel Griffith, Darrell Wheeler, HPTN061 Protocol Team