Institution: | 1. Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China;2. Department of Obstetrics and Gynecology, Suzhou Municipal Hospital, Suzhou, China;3. Department of Obstetrics and Gynecology, Shandong Obstetrics and Gynecology Hospital, Jinan, China;4. Department of Oncology and Pathology, Karolinska Institute, Karolinska University Hospital-Solna, Stockholm, Sweden |