1. Department of Gynaecology and Obstetrics, Ganzhou Maternal and Child Health Hospital, Ganzhou, Jiangxi Province, People’s Republic of China
2. Fetal Medicine Centre, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong Province, People’s Republic of China
3. Department of Medical Genetics, Ganzhou Maternal and Child Health Hospital, Ganzhou, Jiangxi Province, People’s Republic of China