Ryckman Jeffrey M, Kusi Appiah Adams, Simone Charles B, Verma Vivek
a Department of Radiation Oncology , University of Nebraska Medical Center , Omaha , NE , USA.
b Department of Biostatistics , University of Nebraska Medical Center , Omaha , NE , USA.
Acta Oncol. 2018 Jul;57(7):995-1001. doi: 10.1080/0284186X.2018.1426878. Epub 2018 Jan 17.