[1] Natl Canc Ctr, Res Inst E, Psychooncol Div, Kashiwa, Chiba 277, Japan
[2] Natl Canc Ctr Hosp E, Div Psychiat, Kashiwa, Chiba 277, Japan
[3] Natl Canc Ctr Hosp E, Div Thorac Oncol, Kashiwa, Chiba 277, Japan
[4] Natl Canc Ctr Hosp, Dept Psychiat, Cyuo Ku, Tokyo 104, Japan
[5] Hiroshima Univ, Sch Med, Dept Psychiat & Neurosci, Minami Ku, Hiroshima 734, Japan