1. Department of Infectious Diseases, Children Hospital No.2, Ho Chi Minh City, Vietnam
2. Faculty of Pediatrics, University of Medicine and Pharmacy, Ho Chi Minh City, Vietnam
3. University of Medical Center, Ho Chi Minh City, Vietnam
4. London School of Hygiene and Tropical Medicine, London, United Kingdom
5. Health in Harmony, London, United Kingdom
6. Woolcock Institute of Medical Research, Ho Chi Minh City, Vietnam.