title: In Reply to Leung.
authors.affiliation: Department of Radiation Oncology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
authors.forename: John P
authors.initials: JP
authors.lastname: Christodouleas
authors.affiliation: Department of Radiation Oncology, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: Libni J
authors.initials: LJ
authors.lastname: Eapen
authors.affiliation: Department of Radiation Oncology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
authors.forename: Brian C
authors.initials: BC
authors.lastname: Baumann