1. Xiangya Nursing School, Central South University, Changsha, Hunan 410013, China
2. Department of Respiratory, Beijing Tiantan Hospital, Capital Medicine University, Beijing 100050, China
3. Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
4. Clinical Nursing Teaching and Research Section, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China