1. School of Physical Education (Main Campus), Zhengzhou University, Zhengzhou, Henan, PR China
2. Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, Henan, PR China
3. Health Service and Management Undergraduate, Shangzhen College, Henan University of Traditional Chinese Medicine, Zhengzhou, Henan, PR China