Affiliation: | 1. Department of Cardiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan 2. Department of Healthcare Quality Assessment, Graduate School of Medicine, University of Tokyo, Tokyo, Japan 3. Department of Cardiology, Saitama City Hospital, Saitama, Japan 4. Department of Cardiology, Saiseikai Utsunomiya Hospital, Utsunomiya, Japan 5. Department of Cardiology, Hino City Hospital, Tokyo, Japan 6. Center for Clinical Research, Keio University School of Medicine, Tokyo, Japan
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