1. Nursing Management, Evidence-Based Nursing Center, School of Nursing, Lanzhou University , Lanzhou , China
2. Department of Internal Medicine, The First School of Clinical Medicine, Lanzhou University , Lanzhou , China
3. Department of Cardiology, The First Hospital of Lanzhou University , Lanzhou , China
4. Department of Nursing, Gansu Provincial Hospital , Lanzhou, Gansu Province , China