1. Department of Obstetrics and Gynecology, the Affiliated Guangren Hospital, School of Medicine; Xi'an Jiaotong University; China
2. Department of Obstetrics & Gynecology; Shaanxi Province People's Hospital; China
3. Department of Patholgy, the Affiliated Guangren Hospital, School of Medicine; Xi'an Jiaotong University; China
4. Gaoling County Women and Children's Hospital; China
5. GY Highland Biotech LLC; New Jersey USA