[1] Natl Ctr Neurol & Psychiat, Natl Inst Mental Hlth, Dept Sleep Wake Disorders, Kodaira, Tokyo, Japan
[2] Saitama Prefectural Univ, Grad Sch Hlth Sci & Social Work, Saitama, Japan
[3] Natl Ctr Neurol & Psychiat, Natl Ctr Hosp, Dept Lab Med, Kodaira, Tokyo, Japan
[4] Nihon Univ, Dept Psychiat, Sch Med, Tokyo, Japan