1. Department of Gastroenterology Xinqiao Hospital Army Medical University Chongqing City 400037 P. R. China
2. Chongqing Municipality Clinical Research Center for Gastroenterology Office of Science and Technology of Chongqing No. 2 Xingai road Yubei Chongqing 401147 China
3. Department of Mechanical Engineering, Biochemistry and Medical Genetics University of Manitoba Winnipeg Manitoba R3T 2N2 Canada
4. CAS Center for Excellence in Nanoscience CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety National Center for Nanoscience and Technology (NCNST) No. 11 Beiyitiao, Zhongguancun Beijing 100190 China