1. Department of Neonatology, Handan Maternal and Child Health Care Hospital, Handan, PR China;
2. Department of Neonatal Pathology, Handan Maternal and Child Health Care Hospital, Handan, PR China;
3. Department of Pediatrics, Handan 7th Hospital, Handan, PR China;
4. Department of Neural Development and Neural Pathology, Hebei University of Engineering School of Medicine, Handan, PR China