1. Department of General Medicine of Henan Provincial People’s Hospital, Zhengzhou, China;
2. School of Health Policy and Management, Nanjing Medical University, Nanjing, China;
3. Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China;
4. School of Medicine and Health Management, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China;
5. College of Public Health, Zhengzhou University, Zhengzhou, China