1. Department of Pediatrics, The General Hospital of the PLA Rocket Force, Beijing, China (mainland)
2. Central Laboratory, The General Hospital of the PLA Rocket Force, Beijing, China (mainland)
3. Department of Pediatrics, The 306 Hospital of PLA, Beijing, China (mainland)
4. Department of Neonatology, Haidian Maternal and Child Healthcare Hospital, Beijing, China (mainland)
5. Department of Neonatology, Nanjing Tongren Hospital, Nanjing, China (mainland)