1. Department of Otolaryngology, Shengli Clinical Medical College of Fujian Medical University, Fujian Provincial Hospital, Fuzhou, Fujian 350001, P.R. China
2. Department of Obstetrics, Shengli Clinical Medical College of Fujian Medical University, Fujian Provincial Hospital, Fuzhou, Fujian 350001, P.R. China
3. Department of Neonatology, Shengli Clinical Medical College of Fujian Medical University, Fujian Provincial Hospital, Fuzhou, Fujian 350001, P.R. China
4. Department of Neonatology, Fujian Provincial Maternal and Child Health Care Hospital, Fuzhou, Fujian 350001, P.R. China