Affiliation: | 1. Department of Endoscopy, University Medical Center of Ho Chi Minh, , Ho Chi Minh, Vietnam;2. Department of Surgical Pathology, University Medical Center of Ho Chi Minh, , Ho Chi Minh, Vietnam;3. Health Service Center, Hiroshima University, , Higashihiroshima, Japan;4. Kohnodai Hospital, National Center for Global Health and Medicine, , Ichikawa, Japan |