title: [Quasi-experiment study].
authors.affiliation: Department of Epidemiology and Health Statistics, School of Public Health, Xinjiang Medical University, Urumqi 830011, China.
authors.forename: Yalan
authors.initials: Y
authors.lastname: Dou
authors.affiliation: Department of Epidemiology and Health Statistics, School of Public Health, Xinjiang Medical University, Urumqi 830011, China; Email: epi102@sina.com.
authors.forename: Jianghong
authors.initials: J
authors.lastname: Dai
authors.affiliation: Chongqing Medical University.
authors.forename: Ailong
authors.initials: A
authors.lastname: Huang