1. Clinical Study and Evidence Based Medicine Institute of People's Hospital of Gansu Province; Lanzhou China
2. Evidence Based Medicine Center; School of Basic Medical Sciences; Lanzhou University; Lanzhou China
3. Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province; Lanzhou China
4. Department of Internal Medicine; Gansu Rehabilitaition Center Hospital; Lanzhou China
5. School of Basic Medical Sciences; Gansu University of Traditional Chinese Medicine; Lanzhou China