1. Medical Technology College, Chengdu University of Traditional Chinese Medicine of China, Chengdu, Sichuan, P.R. China.
2. Prenatal Diagnosis Center, Hospital of the University of Electronic Science and Technology of China and Sichuan Provincial People's Hospital, Chengdu, Sichuan, P.R. China.
3. Department of Gynecology & Obstetrics, Hospital of the University of Electronic Science and Technology of China and Sichuan Provincial People's Hospital, Chengdu, Sichuan, P.R. China.
4. School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China.
5. Sichuan Provincial Key Laboratory for Human Disease Gene Study, Hospital of the University of Electronic Science and Technology of China and Sichuan Provincial People's Hospital, Chengdu, Sichuan, P.R. China.