1. Neonatal Intensive Care Unit, Department of Pediatrics, The First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, P.R. China
2. Medical Informatics Research Center, Shantou University Medical College, Shantou, Guangdong, P.R. China
3. Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, P.R. China