1. Department of Pediatrics, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City 700000, Vietnam
2. Neonatal Intensive Care Unit, Children’s Hospital 2, Ho Chi Minh City 700000, Vietnam
3. Pediatric and Neonatology Department, Franco-Vietnamese Hospital, Ho Chi Minh City 700000, Vietnam
4. Neonatal Intensive Care Unit, Children’s Hospital 1, Ho Chi Minh City 700000, Vietnam
5. School of Women’s and Children’s Health, Faculty of Medicine, University of New South Wales, Sydney, NSW 2031, Australia
6. Department of Newborn Care, The Royal Hospital for Women, Randwick, Sydney, NSW 2031, Australia