1. Healthcare Delivery Research, MedStar Health Research Institute, Washington, District of Columbia, USA.
2. Department of Oncology, Georgetown University, Washington, District of Columbia, USA.
3. Department of Prevention and Community Health, Milken Institute School of Public Health, George Washington University, Washington, District of Columbia, USA.
4. Department of Health Policy and Management, Milken Institute School of Public Health, George Washington University, Washington, District of Columbia, USA.
5. Department of Pediatrics, George Washington University, Children’s National Hospital, Washington, District of Columbia, USA.
6. GW Cancer Center, George Washington University, Washington, District of Columbia, USA.