1 Division of Neuropsychiatry, Department of Neuroscience, Yamaguchi University Graduate School of Medicine, Ube, Japan.
2 Department of Psychiatry, National Hospital Organization Obihiro Hospital, Obihiro, Japan.
3 Institute for Global Health Policy Research, Bureau of International Health Cooperation, National Center for Global Health and Medicine, Tokyo, Japan.
4 Cancer Control Center, Osaka International Cancer Institute, Osaka, Japan.