1. Clinical Nursing Teaching and Research Section, The Second Xiangya Hospital of Central South University Changsha China
2. School of Public Health, Central South University Changsha China
3. Department of Ophthalmology The Second Xiangya Hospital of Central South University Changsha China
4. Department of Cardiovascular Medicine The Second Xiangya Hospital of Central South University Changsha China
5. Key Laboratory of Medical Information Research (Central South University), College of Hunan Province Changsha China