title: Erratum to: Interactive X-ray and proton therapy training and simulation.
authors.affiliation: Computer Science and Information Technology, Armstrong State University, Savannah, GA, USA. Felix.Hamza-Lup@armstrong.edu.
authors.forename: Felix G
authors.initials: FG
authors.lastname: Hamza-Lup
authors.affiliation: Computer Science and Information Technology, Armstrong State University, Savannah, GA, USA.
authors.forename: Shane
authors.initials: S
authors.lastname: Farrar
authors.affiliation: Computer Science and Information Technology, Armstrong State University, Savannah, GA, USA.
authors.forename: Erik
authors.initials: E
authors.lastname: Leon