1. Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
2. Faculty of Medicine, Tra Vinh University, Tra Vinh Province, Vietnam
3. Department of Infectious Diseases, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
4. Department of Scientific Research, District 2 Hospital, Ho Chi Minh City, Vietnam
5. Department of Disease Control and HIV/AIDS, Tan Hong District Health Center, Tan Hong District, Dong Thap Province, Vietnam
6. Infection Control Department, University Medical Center Ho Chi Minh City, Ho Chi Minh City, Vietnam