1. Key Laboratory of Evidence-based Medicine and Knowledge Translation of Gansu Province, Lanzhou University, Lanzhou, China.
2. Evidence-Based Nursing Center, School of Nursing, Lanzhou University, Lanzhou, China.
3. The First Clinical Medical College, Lanzhou University, Lanzhou, China.
4. Evidence-Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China.