1. Cheeloo College of Medicine Shandong University Jinan China
2. Department of Radiation Oncology Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Science Jinan China
3. Weifang Medical University Weifang China
4. Department of Obstetrics and Gynecology Qilu Hospital of Shandong University Jinan China