title: A cross-sectional study among men who have sex with men: a comparison of online and offline samples in Hunan Province, China.
authors.affiliation: Department of Epidemiology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing 100005, China.
authors.forename: Jian-min
authors.initials: JM
authors.lastname: Xing
authors.forename: Kong-lai
authors.initials: KL
authors.lastname: Zhang
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Zheng
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D002681:China; D003430:Cross-Sectional Studies; D018451:Homosexuality, Male / Q000706:statistics & numerical data*; D006801:Humans; D020407:Internet / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires; D055815:Young Adult