1 Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan; Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan. Electronic address: ykikuchi@sand.ocn.ne.jp.
2 Department of Psychiatry, Tohoku University Hospital, Sendai, Miyagi, Japan.
3 Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan; Department of Psychiatry, Tohoku University Hospital, Sendai, Miyagi, Japan.