1. Department of Endoscopy Tianjin Medical University Cancer Institute and Hospital National Clinical Research Center for Cancer Key Laboratory of Cancer Prevention and Therapy of Tianjin Tianjin's Clinical Research Center for Cancer Tianjin People's Republic of China
2. Inner Mongolia Baotou Teachers College of Inner Mongolia University of Science and Technology Baotou People's Republic of China
3. Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Institute of Health and Environmental Medicine Tianjin People's Republic of China
4. NO.946 Hospital of PLA Yining Xinjiang People's Republic of China
5. Inner Mongolia North Heavy Industry No.5 Middle School Baotou Inner Mongolia People's Republic of China
6. Institute of Microbiology and Epidemiology Academy of Military Medical Sciences Beijing People's Republic of China