1. Department of Gastroenterology People's hospital of Jiangbei Nanjing China
2. Department of General Surgery The Affiliated Jiangning Hospital of Nanjing Medical University Nanjing China
3. Department of Oncology People's Hospital of Rizhao Rizhao China
4. Department of Gynecology and Obstetrics Weifang Hospital of Maternal and Child Health Weifang China
5. Department of Antenatal Diagnosis People's Hospital of Weifang Weifang China
6. Operating Room People's Hospital of Zhucheng Zhucheng China