1. Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, China, 610041
2. Prenatal Diagnosis Center, Department of Obstetrics & Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China, 610041
3. Key Laboratory of Birth Defects & Related Diseases of Women & Children (Sichuan University), Ministry of Education, Chengdu, China, 610041