1. Postgraduate Department, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
2. Head of Branch 2, University Medical Center Ho Chi Minh City, Ho Chi Minh City, Vietnam
3. Department of Ophthalmology, Children’s Hospital 1, Ho Chi Minh City, Vietnam
4. Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
5. Training and Scientific Research Department, University Medical Center Ho Chi Minh City, Ho Chi Minh City, Vietnam