Han Shuangyin: chief physician, M.D. of Tohoku University. In 2010, he received the qualification as a doctor and master's supervisor in Zhengzhou University. He is a vice-chairman of Gastroenterology Department of Henan Medical Association, vice-chairman of Henan Tumor Biotherapy Association and editorial board member of Journal of Chinese Practical Diagnosis and Therapy, Chinese Journal of Cancer Biotherapy and World Chinese Journal of Digestology. He is engaged in the clinical diagnosis and treatment of digestive tract diseases and research of the tumor immunotherapy/gene therapy. He has published more than 20 papers on SCI and more than 40 papers on Chinese core journals, and has undertaken 3 projects of National Natural Science Foundation and 2 provincial and department-level research projects with the research fund of more than 2 million yuan. Field: training and research of clinical medical skills (for digestive system diseases).