Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 44 3 2015 03 15 420 1 Shaochun Yang Dept. of Epidemiology and Health Statistics, School of Public Health, Soochow University, Suzhou, China. Ying Fu Dept. of Epidemiology and Health Statistics, School of Public Health, Soochow University, Suzhou, China. Yunhua Zhou Dept. of Epidemiology and Health Statistics, School of Public Health, Soochow University, Suzhou, China. Yuhua Ruan Dept. of AIDS/STDs Prevention, Chinese Center for Disease Control and Prevention, Beijing, China. Dongliang Li Dept. of AIDS/STDs Prevention, Chaoyang Center for Disease Control and Prevention, Beijing, China. Ge Gao Dept. of Epidemiology and Health Statistics, School of Public Health, Soochow University, Suzhou, China. 2015 10 14 No Abstract https://ijph.tums.ac.ir/index.php/ijph/article/view/3621 https://ijph.tums.ac.ir/index.php/ijph/article/download/3621/3296