1. West China School of Nursing and Department of Nursing; West China Hospital; Sichuan University; Chengdu China
2. Department of Gastrointestinal Surgery; West China Hospital; Sichuan University; Chengdu China
3. Chinese Evidence-Based Medicine/Cochrane Center; Chengdu China
4. Department of Nursing; West China Hospital; Sichuan University; Chengdu China