1. Cancer Board Division, Radiation Therapy Center, Hitachinaka General Hospital, Hitachinaka, Ibaraki, Japan.
2. Department of Palliative Care, amd Hitachinaka General Hospital, Hitachinaka, Ibaraki, Japan.
3. Department of Gastroenterology, Hitachinaka General Hospital, Hitachinaka, Ibaraki, Japan.