1. Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China
2. Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
3. Department of Respirology, Xinqiao Hospital, Third Military Medical University, Chongqing, China
4. Department of Health Statistics, College of Preventive Medicine, Third Military Medical University, Chongqing, China