1 Department of Radiation Oncology, Levine Cancer Institute, Atrium Health, Charlotte, NC, USA; Southeast Radiation Oncology, Charlotte, NC, USA.
2 Department of Hematology and Medical Oncology, Levine Cancer Institute, Atrium Health, Charlotte, NC, USA.
3 Department of Biostatistics and Data Sciences, Levine Cancer Institute, Atrium Health, Charlotte, NC, USA.
4 Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA; New York Proton Center, New York, NY 10035, USA. Electronic address: csimone@nyproton.com.