Characteristics of HIV intervention prevention studies among Chinese men who have sex with men.

NOTE: EBS: establishment-based sampling; RDS: respondent-driven sampling; PDS: peer-driven sampling; WDS: web-driven sampling; SBS: snowball sampling; IEC: information, education, communication; QES: quasi-experimental study, SCIS: serial cross-sectional intervention studies; SPIS: self-pre-and-post intervention studies without comparison group; RCT: randomized control trial; N/A: Not available.