1. Lanzhou University; Evidence-Based Medicine Center, School of Basic Medical Sciences; No. 199, Donggang West Road Lanzhou City Gansu China 730000
2. Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province; Lanzhou City Gansu Province China
3. Liaocheng People's Hospital; Vascular Surgery; No. 67, Dongchang West Road Liaocheng City Shandong Province China 252000
4. Lanzhou University; Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province; Lanzhou City China
5. Lanzhou Univeristy; Radiation Oncology Centre of Gansu Tumour Hospital; No. 2, Xioaxihu East Road Lanzhou City Gansu China 730050