1 Department of Psychiatry, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan. Electronic address: yhatano@koto.kpu-m.ac.jp.
2 Department of Pain Management & Palliative Care Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan.
3 Department of Psychiatry, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.