1. College of Public Health, Zhengzhou University, Zhengzhou 450001, China
2. Henan Key Laboratory of Tumor Epidemiology & State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou University, Zhengzhou 450052, China
3. Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450052, Henan Province, China
4. School of Nursing and Health, Zhengzhou University, Zhengzhou 450001, China