1. Department of Internal Medicine, Yoshida Hospital, Nara, Japan
2. Department of Palliative Medicine, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
3. Department of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
4. Department of Primary Care and Medical Education, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan