1. Department of Genetic and Metabolic Central Laboratory Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Guangxi Birth Defects Prevention and Control Institute Nanning China
2. Department of Clinical Genetics Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region Nanning China
3. Department of Ultrasound Examination Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region Nanning China
4. Division of Genetics and Genomics, Boston Children's Hospital, Department of Neurology Harvard Medical School Boston MA USA