1. Faculty of Medical Management, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
2. University Medical Center HCMC, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
3. Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
4. Long An General Hospital, Tan An, Long An, Vietnam
5. Tan Hung District Medical Center, Tan Hung, Tan An, Long An, Vietnam
6. Institute of Public Health, Ho Chi Minh City, Vietnam