1. Department of Epidemiology and Health Statistics, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
2. College of Public Health, Henan Key Laboratory of Tumor Epidemiology, Zhengzhou University, Zhengzhou, Henan, China
3. Henan Academy of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan, China