1. Department of Cardiology, Keio University School of Medicine, Tokyo, Japan (S.S., S.K., M.S., Y.S., K.H., S.Y., K.F.).
2. Healthcare Quality Assessment, Graduate School of Medicine, The University of Tokyo, Japan (H.K., H.M.).
3. Clinical and Translational Research Center, Keio University Hospital, Tokyo, Japan (I.U.).
4. Department of Cardiology, Saiseikai Utsunomiya Hospital, Tochigi, Japan (S.N.).
5. Department of Cardiology, National Hospital Organization Saitama National Hospital, Japan (M.S.).
6. Department of Cardiology, Japanese Red Cross Ashikaga Hospital, Tochigi, Japan (Y.N.).