1. School of Public Health, Sun Yat-sen University, Guangzhou, People’s Republic of China
2. Center for Migrant Health Policy, Sun Yat-sen University, Guangzhou, People’s Republic of China
3. Sun Yat-sen Global Health Institute, Institute of State Governance, Sun Yat-sen University, Guangzhou, People’s Republic of China
4. Department of Health Administration and Policy, College of Health and Human Services, George Mason University, Fairfax, VA, USA
5. Department of Infectious Disease, Guangzhou Number Eight People’s Hospital, Guangzhou, People’s Republic of China
6. School of Public Health, Texas A&M University, College Station, TX, USA