[1] Kyoto Univ, Kyoto, Japan
[2] Natl Cardiovasc Ctr, Res Inst, Suita, Osaka 565, Japan
[3] Osaka Univ, Suita, Osaka, Japan
[4] Chiba Univ, Chiba, Japan
[5] Fussa Hosp, Fussa, Japan
[6] Int Univ Hlth & Welf, Fukuoka, Japan
[7] Nippon Med Coll, Tokyo 113, Japan
[8] Kanazawa Univ, Kanazawa, Ishikawa 920, Japan
[9] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan
[10] Ibaraki Christian Univ, Hitachi, Ibaraki, Japan
[11] Kobe Univ, Kobe, Hyogo 657, Japan
[12] Univ Tokyo, Tokyo, Japan
[13] Teikyo Univ, Tokyo 173, Japan
[14] Keisen Clin, Akashi, Hyogo, Japan