Abstract :
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/S0140-6736(15)00697-2 Byline: Eric P Cohen, Brian L Fish, John E Moulder Author Affiliation: (a) Baltimore VA Medical Center and the University of Maryland School of Medicine, Baltimore, MD, USA (b) Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, WI, USA