1 Capital Institute of Pediatrics, Beijing, China.
2 Department of Neonatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.
3 Laboratory of Tumor Immunology, Beijing Pediatric Research Institute, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.
4 Department of Neonatology, Children's Hospital, Capital Institute of Pediatrics, Beijing, China.
5 Laboratory of Tumor Immunology, Beijing Pediatric Research Institute, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China. Electronic address: jingang_gui@163.com.
6 Department of Neonatology, Children's Hospital, Capital Institute of Pediatrics, Beijing, China. Electronic address: cxswyj@vip.sina.com.