1 Department of Endocrinology, Genetics and Metabolism, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China.
2 Center for Clinical Epidemiology & Evidence-Based Medicine, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China.
3 Beijing Key Laboratory for Genetics of Birth Defects, Beijing 100045, China.