1. Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan.
2. Department of Quality Improvement, NTT Medical Center Tokyo, Tokyo, Japan.
3. Department of Medical Oncology, Kyorin University Faculty of Medicine, Tokyo, Japan.
4. Department of Chemotherapy and Palliative Care, Tokyo Women's Medical University, Tokyo, Japan.
5. Department of Surgery, Teikyo University School of Medicine, Tokyo, Japan.
6. Department of Palliative Medicine, Teikyo University School of Medicine, Tokyo, Japan.