1. School of Public Health at Anhui Medical University, University of Hefei, China.
2. Hefei Youth Social Organization, Hefei, China.
3. Chengdu Tongle Health Counseling Service Center, Chengdu, China.
4. Center for Disease Control and Prevention in Wuhan, China.
5. Center for Disease Control and Prevention in Suzhou, China.
6. Center for Disease Control and Prevention in Chengdu, China.
7. School of Public Health, Brown University, Providence, Rhode Island.
8. Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland.
9. Fay W. Boozman College of Public Health University of Arkansas for Medical Sciences, Little Rock, Arkansas.