1. Laboratory of Clinical, Epidemiological, and Health Services Research, Clinical Research Center, National Hospital Organization Nagoya Medical Center, Aichi, Japan.
2. Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts.
3. Division of Population Sciences, Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts.
4. Division of General Medicine, Brigham and Women's Hospital, Boston, Massachusetts.
5. Cancer Care Ontario, Ontario Institute for Cancer Research, and the Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada.