1. University of North Carolina Project-China, Guangzhou, People’s Republic of China
2. University of Maryland School of Medicine, Baltimore, MD, USA
3. Department of Social Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
4. Department of Infectious Diseases, Guangzhou Eighth People’s Hospital, Guangzhou, People’s Republic of China
5. Institute for Global Health and Infectious Diseases, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA