“…Forty-two interventions were categorized into 5 socioecological levels and characteristics of interventions on each level are presented in Additional file 1 : Tables S1–S5, respectively. PrEP interventions for MSM were reported to implement in the US South (Florida, Georgia, Texas, Maryland, Mississippi, North Carolina and D.C.) [ 30 – 40 ], Northeast (Pennsylvania, New York, Massachusetts and Rhode Island) [ 27 , 31 – 33 , 36 , 38 , 41 – 49 ], Midwest (Illinois, Michigan, and Wisconsin) [ 24 – 26 , 32 , 33 , 36 , 47 , 50 – 52 ], West (California) [ 51 , 53 – 58 ] and nationwide [ 59 – 63 ]. Thirty-seven of the 42 studies focused solely on MSM [ 24 – 27 , 30 – 34 , 36 – 41 , 43 – 47 , 49 – 54 , 56 , 58 – 72 ], with some targeting Black, Hispanic/Latino MSM or MSM younger than 34 years old [ 24 – 27 , 30 – 34 , 36 – 40 , 44 – 46 , 49 , 50 , 52 , 56 , 58 , 60 – 63 , 70 ].…”