1National Human Genetic Resources Center, National Research Institute for Family Planning, Beijing, 100081 People’s Republic of China
2Prenatal Diagnosis Center, Shijiazhuang Obstetrics and Gynecology Hospital, Hebei Province, Shijiazhuang, 050011 People’s Republic of China
3Genetic Center, National Research Institute for Family Planning, Beijing, 100081 People’s Republic of China
4Department of Obstetrics, Shijiazhuang Obstetrics and Gynecology Hospital, Hebei Province, No. 206, East Zhongshan Road, Shijiazhuang, 050011 People’s Republic of China
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