1. 1Department of Gastroenterology, The First Hospital of Lanzhou University, Chengguan District, Lanzhou, Gansu, China.
2. 2Key Laboratory for Gastrointestinal Diseases of Gansu Province, Lanzhou University, Chengguan District, Lanzhou, Gansu, China.
3. 3Gansu Wuwei Tumor Hospital, Liangzhou District, Wuwei, Gansu, China.
4. 4Gansu Provincial Second People's Hospital, Chengguan District, Lanzhou, Gansu, China.
5. 5School of Basic Medical Sciences, Lanzhou University, Chengguan District, Lanzhou, Gansu, China.
6. 6Lanzhou University Second Hospital, Chengguan District, Lanzhou, Gansu, China.
7. 7Wuwei Liangzhou Hospital, Liangzhou District, Wuwei, Gansu, China.
8. 8Wuwei People's Hospital, Liangzhou District, Wuwei, Gansu, China.
9. 9Minqin People's Hospital, Minqin, Gansu, China.
10. 10Surgical Oncology Department, The First Hospital of Lanzhou University, Chengguan District, Lanzhou, Gansu, China.
11. 11School of Public Health, Lanzhou University, Chengguan District, Lanzhou, Gansu, China.
12. 12Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
13. 13Storr Liver Centre, Westmead Institute for Medical Research, University of Sydney and Westmead Hospital, Westmead, New South Wales, Australia.