About the Authors
Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland, United States of America
Comparative Oncology Program, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland, United States of America
The authors have declared that no competing interests exist.
ICMJE criteria for authorship read and met: IKG MP CM CK. Agree with the manuscript's results and conclusions: CM. Wrote the first draft of the paper: IKG. Contributed to the writing of the paper: IKG MP CK.