title: In Regard to Perrier et al.
authors.affiliation: Department of Radiotherapy, San Raffaele Scientific Institute, Milan, Italy.
authors.forename: Andrei
authors.initials: A
authors.lastname: Fodor
authors.affiliation: Department of Radiotherapy, San Raffaele Scientific Institute, Milan, Italy.
authors.forename: Nadia G
authors.initials: NG
authors.lastname: Di Muzio