1. Institute for Clinical Research & Health Policy Studies, Tufts Medical Center, Boston, MA, USA
2. Division of Hematology/Oncology, Tufts Medical Center, Boston, MA, USA
3. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, CA, USA
4. MedHealth Statistical Consulting Inc., Solon, OH, USA
5. Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, USA
6. Department of Medicine and Pediatrics, Tufts University School of Medicine, Boston, MA, USA