[1] Toho Univ, Sch Med, Omori Hosp, Psychotherapy & Internal Med Dept, Funabashi, Chiba, Japan
[2] Meiwa Kai Sapporo Meiwa Hosp, Psychotherapy & Internal Med Dept, Sapporo, Hokkaido, Japan
[3] Tohoku Univ, Med Sch Hosp, Psychotherapy & Internal Med Dept, Sendai, Miyagi 98, Japan
[4] Tohoku Univ Hosp Branch, Psychotherapy & Internal Med Dept, Sendai, Miyagi, Japan
[5] Tokai Chuo Hosp, Publ Sch Mutual Aid Assoc, Dept Neurol, Tokai, Ibaraki, Japan
[6] Kyushu Univ, Sch Med, Dept Internal Med 1, Fukuoka 812, Japan
[7] Kyushu Univ, Sch Med, Psychotherapy & Internal Med Dept, Fukuoka 812, Japan