1 Department of Radiation Oncology, University of Florida, Jacksonville, FL, USA.
2 Department of Pediatrics, Emory University/Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, GA USA.
3 Department of Biostatistics, Children's Oncology Group, Statistics and Data Center, University of Florida, Gainesville, FL, USA.
4 Institute for Clinical Research and Health Policy Studies and Tufts Cancer Center, Tufts Medical Center, Boston, MA, USA.
5 Department of Radiation Oncology, Yale University School of Medicine, Yale Cancer Center, New Haven, Connecticut, USA.
6 Department of Radiation Oncology, Princess Margaret Cancer Center and University of Toronto, Toronto, Ontario, Canada.
7 Department of Radiation Oncology, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.
8 Imaging and Radiation Oncology Core (IROC), Rhode Island, Lincoln, RI, USA.
9 Department of Radiation Oncology, University of Massachusetts Medical School, Worcester, MA, USA.
10 Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA.
11 Department of Pediatrics, Roswell Park Comprehensive Cancer Center; University at Buffalo Jacobs School of Medicine and Biomedical Sciences, Buffalo, NY, USA.
12 Department of Radiation Oncology, Mayo Clinic Florida, Jacksonville FL, USA.