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Missed opportunities and barriers for HIV testing among men who have sex with men who have never tested: (a) originating from health care providers, (b) and reported participant experiences, Hanoi, Vietnam, 2017–2019 (n = 745). * For participants who noticed any suspected STI symptoms, n = 346. ** Calculated as the sum of 737 due to missing data (<2%). *** For RDS and IBS only, n = 390.
