“…Yet, the study incorporated a survey on user acceptability after performance of HST to which we refer in the discussion section. Two studies were performed in Sub-Saharan Africa [24,26], six in the USA [19,20,23,25,28,29], two in Spain [21,22], and one in Singapore [27]. Study populations consisted of risk groups like health care workers (HCW) [26], men who have sex with men (MSM), injecting drug users (IDU), clients of sexually transmitted infection (STI) clinics, women with multiple sexual partners or HIV-seropositive sexual partners [19,20,23,27-29] and the general population [21,22,24,25].…”