1. Department of Medical Oncology; Dana-Farber Cancer Institute; Boston Massachusetts
2. Department of Health Care Policy; Harvard Medical School; Boston Massachusetts
3. Division of General Internal Medicine; Brigham and Women's Hospital; Boston Massachusetts
4. Department of Medical Oncology, INSERM Unit 981; Institute Gustave Roussy; Villejuif France
5. Department of Pharmacoepidemiology; Brigham and Women's Hospital; Boston Massachusetts
6. Department of Biostatistics and Computational Biology; Dana-Farber Cancer Institute; Boston Massachusetts