1. College of Public Health, Zhengzhou University, Zhengzhou, Henan Province, China
2. Key Laboratory of Tumor Epidemiology of Henan Province, Zhengzhou, Henan Province, China
3. Medical Research Office, Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
4. Department of Internal Medicine, The First Affiliated Hospital of Zhengzhou University,Zhengzhou, Henan Province, China