Yan-Chang Lei, PhD, medicine postdoctoral, chief physician, Director of Gastroenterology Department , Liuzhou People’s Hospital,Guangxi Medical University,supervisor of postgraduate.Member of the Standing Committee of Gastroenterology branch of Guangxi Medical Association,Member of the Standing Committee of digestive endoscopy of Guangxi Integrative Medicine.I graduated from Huazhong University of Science and Technology in 2003 and receive a doctor’s degree and postdoctoral research experience in immunology.I have been engaged in clinical scientific research and teaching of internal medicine for more than 20 year’s, I have worked in the First Affiliated Hospital and infectious disease hospital of Nanchang University,then to Zhejiang Hospital in Zhejiang province,and now worked in Liuzhou People’s Hospital,Guangxi Medical University .Up to now, Presided over 2 projects of National Natural Science Foundation of China and 1 projects of Natural Science Foundation of Guangxi province,the main research direction is digestive liver disease.I have published more than 30 academic papers,ten of them are SCI papers and served as WJG editorial board member for five years.