1 Department of Neuropsychiatry, Keio University School of Medicine, Japan; Komagino Hospital, Japan.
2 Department of Neuropsychiatry, Keio University School of Medicine, Japan.
3 Department of Neuropsychiatry, Kyorin University School of Medicine, Japan.
4 Department of Psychiatry and Advanced Medical Technology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan. Electronic address: kito@ncnp.go.jp.