1. Department of Obstetrics and Gynecology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, P. R. China.
2. Medical Science and Technology Innovation Center, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, P. R. China.
3. The Affiliated Taian City Central Hospital of Qingdao University, Taian, P. R. China.
4. Department of Gynaecology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, P. R. China.
5. Shandong First Medical University, Tai’an, P. R. China.
6. Shandong First Medical University, Jinan, P. R. China.
7. Rizhao People’s Hospital, Rizhao, P. R. China.
8. Tai’an Maternal and Child Health Hospital, Tai’an, P. R. China.
9. Division of Oral Biotechnology, Center for Dental Medicine, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
10. Center of Obstetrics and Gynecology, Peking University Shenzhen Hospital, Shenzhen, P. R. China.
11. Institute of Obstetrics and Gynecology, Shenzhen PKU-HKUST Medical Center, Shenzhen, P. R. China.
12. Shenzhen Key Laboratory on Technology for Early Diagnosis of Major Gynecologic Diseases, Shenzhen, P. R. China.
13. Shandong Agriculture University, Tai’an, P. R. China.