1. Department of Clinical MedicineGansu University of Traditional Chinese Medicine Lanzhou China
2. Department of Thoracic Surgery, Gansu Province People's Hospital Lanzhou China
3. Institution of Clinical Research and Evidence Based Medicine, Gansu Province People's Hospital Lanzhou China
4. Evidence‐Based Medicine Center, School of Basic Medical SciencesLanzhou University Lanzhou China
5. The Second Department of Hepatobiliary Surgery, Chinese PLA General Hospital Beijing China
6. Clinical DivisionHong Kong Baptist University Hong Kong, China