Department of Neonatology, Maternal and Child Health Hospital of Hubei Province, Department of Neonatology, Maternal and Child Health Hospital of Hubei Province, Department of Neonatology, Xiaochang First People’s Hospital, Department of Neonatology, Maternal and Child Health Hospital of Hubei Province, Health, Nutrition and WASH, UNICEF China, UNICEF East Asia and Pacific Regional Office, Health, Nutrition and WASH, UNICEF China, Huazhong University of Science and Technology - Department of Laboratory Medicine, Department of Neonatology, Maternal and Child Health Hospital of Hubei Province, Department of Neonatology, Maternal and Child Health Hospital of Hubei Province, Department of Neonatology, Maternal and Child Health Hospital of Hubei Province, Department of Neonatology, Maternal and Child Health Hospital of Hubei Province and Maternal and Child Health Hospital of Hubei Province - Department of Neonatology