1. Department of Pediatrics, Division of Neonatology The Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
2. Department of Neonatology, Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Guangzhou China
3. Department of Pathology The Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
4. Division of General, Thoracic and Fetal Surgery The Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
5. Emeritus, Pediatrics McMaster University Hamilton Ontario Canada
6. Emeritus University of Pennsylvania Philadelphia Pennsylvania USA
7. Division of Neonatology and Center for Newborn Care Guangzhou Women and Children's Medical Center Guangdong China