1. Department of Medical Statistics, School of Public Health, Sun Yat-sen University, Guangzhou, People’s Republic of China
2. Training and Evaluation Center of Guangdong Power Grid Company Limited, 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 HIV/AIDS Prevention and Control, Guangzhou Center for Disease Prevention and Control, Guangzhou, People’s Republic of China