Multi-institutional Comparison of Intensity Modulated Photon Versus Proton Radiation Therapy in the Management of Squamous Cell Carcinoma of the Anus oleh Jahan J. Mohiuddin, MD, Krishan R. Jethwa, MD, Nikhil Grandhi, BS, William G. Breen, MD, Xingmei Wang, MS, Akbar Anvari, PhD, Hui Lin, PhD, Harigopal Sandhyavenu, MBBS, Abigail Doucette, MPH, John P. Plastaras, MD, PhD, William G. Rule, MD, James M. Metz, MD, Kenneth W. Merrell, MD, Terence T. Sio, MD, Jonathan B. Ashman, MD, PhD, Michael G. Haddock, MD, Edgar Ben-Josef, MD, Christopher L. Hallemeier, MD, Andrzej P. Wojcieszynski, MD