

Professor, College of Public Health, Zhengzhou University, 2014-
Associate Professor, College of Public Health, Zhengzhou University, 2000-2014
Lecturer, College of Public Health, Henan Medical University, 1994-2000
Professor, College of Public Health, Zhengzhou University, 2014-
Associate Professor, College of Public Health, Zhengzhou University, 2000-2014
Lecturer, College of Public Health, Henan Medical University, 1994-2000