1. Radiation Oncology Centre of Gansu Tumour Hospital; Lanzhou University; Lanzhou City China
2. Evidence-Based Medicine Center, School of Basic Medical Sciences; Lanzhou University; Lanzhou City China
3. Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province; Lanzhou University; Lanzhou City China
4. Second Hospital of Lanzhou University; Lanzhou City China
5. Department of Oncology; The First Hospital of Lanzhou University; Lanzhou City China
6. Department of General Surgery; The People's Hospital of Gansu Province; Lanzhou City China