| Affiliation: | 1. The First Clinical Medical College of Lanzhou University, Lanzhou 730000, PR China;2. Department of Obstetrics and Gynecology, Gansu Provincial Hospital, Lanzhou 730000, PR China;3. Evidence-Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, 730000, PR China;4. Institution of Clinical Research and Evidence Based Medicine, Gansu Provincial Hospital, Lanzhou 730000, PR China;5. The Second Department of Hepatobiliary Surgery, Chinese PLA General Hospital, Beijing, 100853, PR China;6. Department of Clinical Medicine, Gansu University of Traditional Chinese Medicine, Lanzhou, 730000, PR China;7. Department of General Surgery, Gansu Provincial Hospital, Lanzhou 730000, PR China;8. School of Public Health, Lanzhou University, Lanzhou, 730000, PR China;9. Key laboratory of Evidence-Based Medicine and Knowledge Translation of Gansu Province, Lanzhou 730000, PR China |
