Satoshi Yoshimura1, Han-Seung Yoon2. 1. Department of Cardiology (Yoshimura), Hakujujikai Sasebo Chuo Hospital; Department of Pathology (Yoon), Centre for Digital Pathology Education, Nagasaki University Graduate School of Biomedical Science, Nagasaki, Japan yoshimuras1986@gmail.com. 2. Department of Cardiology (Yoshimura), Hakujujikai Sasebo Chuo Hospital; Department of Pathology (Yoon), Centre for Digital Pathology Education, Nagasaki University Graduate School of Biomedical Science, Nagasaki, Japan.