1. Department of Endocrinology, Genetics and Metabolism, Beijing Children's Hospital, Capital Medical University, Beijing, China.
2. Department of Pediatrics, Peking University First Hospital, Beijing, China.
3. Department of Pediatrics, Third Hospital Peking University, Beijing, China.
4. Department of Pediatrics, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
5. Affiliated Children's Hospital of Capital Institute of Pediatrics, Beijing, China.