1 Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth, and Thayer School of Engineering at Dartmouth, Lebanon, New Hampshire. Electronic address: David.J.Gladstone@Hitchcock.org.
2 Department of Radiation Physics, IROC (Imaging and Radiation Oncology Core) Houston Quality Assurance Center, The University of Texas MD Anderson Cancer Center, Houston, Texas.
3 Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Department of Radiation Oncology, Henry Ford Health System, Detroit, Michigan.