[1] Kyoto Univ, Sch Med, Dept Geriatr Med, Sakyo Ku, Kyoto 6068507, Japan
[2] Natl Cardiovasc Ctr, Osaka, Japan
[3] Osaka Univ, Dept Internal Med, Osaka, Japan
[4] Chiba Univ, Dept Internal Med, Chiba, Japan
[5] Univ Tsukuba, Dept Internal Med, Ibaraki, Japan
[6] Nippon Med Coll, Dept Internal Med, Tokyo, Japan
[7] Kanazawa Univ, Dept Internal Med, Kanazawa, Ishikawa, Japan
[8] Teikyo Univ, Dept Internal Med, Tokyo, Japan
[9] Int Univ Hlth & Welf, Tochigi, Japan
[10] Fussa Hosp, Tokyo, Japan
[11] Ibaraki Christian Univ, Ibaraki, Japan
[12] Kobe Univ, Fac Hlth Sci, Hyogo, Japan
[13] Univ Tokyo, Dept Geriatr Med, Tokyo, Japan
[14] Keisen Clin, Tokyo, Japan
[15] BML Inc, Dept Adv Technol & Dev, Tokyo, Japan
[16] Osaka City Univ, Sch Med, Osaka 545, Japan
[17] Kyoto Univ, Grad Sch Med, Dept Cardiovasc Med, Kyoto, Japan