[1] Xi An Jiao Tong Univ, Hlth Sci Ctr, Sch Publ Hlth, China Australia Joint Res Ctr Infect Dis, Xian 710061, Shaanxi, Peoples R China
[2] Key Lab Dis Prevent & Control & Hlth Promot Shaan, Xian, Shaanxi, Peoples R China
[3] Melbourne Sexual Hlth Ctr, Alfred, Vic, Australia
[4] Monash Univ, Cent Clin Sch, Fac Med Nursing & Hlth Sci, Melbourne, Vic, Australia
[5] Zhengzhou Univ, Dept Epidemiol & Biostat, Coll Publ Hlth, Zhengzhou, Henan, Peoples R China