[1] Keio Univ, Sch Med, Dept Cardiol, Shinjuku Ku, Tokyo, Japan
[2] Univ Tokyo, Tokyo, Japan
[3] Saiseikai Utsunomiya Hosp, Dept Cardiol, Utsunomiya, Tochigi, Japan
[4] Saitama Natl Hosp, Natl Hosp Org, Dept Cardiol, Wako, Japan
[5] Eiju Gen Hosp, Dept Cardiol, Tokyo, Japan
[6] Saitama City Hosp, Dept Cardiol, Saitama, Japan
[7] Natl Hosp Org Tokyo Med Ctr, Tokyo, Japan
[8] Saiseikai Cent Hosp, Dept Cardiol, Tokyo, Japan
[9] Kawasaki Municipal Hosp, Dept Cardiol, Kawasaki, Kanagawa, Japan
[10] Isehara Kyodo Hosp, Dept Cardiol, Isehara, Kanagawa, Japan
[11] Ashikaga Red Cross Hosp, Dept Cardiol, Ashikaga, Japan
[12] Mitsui Mem Hosp, Tokyo 101, Japan
[13] Int Univ Hlth & Welf, Tokyo, Japan
[14] Keio Univ, Sch Med, Clin Res Ctr, Tokyo, Japan