Wednesday, May 25th, six faculty and staff members from University of Ulsan College of Medicine and Asan Medical Center visited Hokkaido University Hospital in South Korea. Professor Hidefumi Aoyama, Chairman of the Department of Radiation Oncology and the Radiation Oncology Division of Global Center for Biomedical Science and Engineering, gave them a tour of the Proton Beam Therapy Center, together with Assistant Professor Masaya Tamura, GCB collaborative researcher.