1. Department of Cerebrovascular Diseases, The Second Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, China
2. Department of Internal Medicine, Clinical Medicine School, Yunnan Traditional Chinese Medicine University, Kunming, Yunnan Province, China
3. Yunnan Communications Vocational and Technical College, Institute of International Exchange, Kunming, Yunnan Province, China
4. Department of Epidemiology and Statistics, Public Health School, Kunming Medical University, Kunming, Yunnan Province, China
5. Department of Emergency, The Second Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, China