1. Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou, China
2. Henan Key Laboratory of Tumor Epidemiology, Zhengzhou University, Zhengzhou, China
3. Office of Health Care, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
4. Department of Prenatal Diagnosis Center, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
5. State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou University, Zhengzhou, China