1 Department of Radiation Oncology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
2 Beijing Neurosurgical Institute, Capital Medical University, Beijing, China.
3 Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
4 Department of Clinical Nutrition, Beijing Children's Hospital, Capital Medical University, Beijing, China.
5 Centre of Endocrinology Genetics and Metabolism, National Centre for Children's Health, Beijing Children's Hospital, Capital Medical University, Beijing, China.