title: Erratum to: Surgical spacer placement prior carbon ion radiotherapy (CIRT): an effective feasible strategy to improve the treatment for sacral chordoma.
authors.affiliation: Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy. l.cobianchi@smatteo.pv.it.|IRCCS Policlinico San Matteo Foundation, General Surgery 1, Pavia, Italy. l.cobianchi@smatteo.pv.it.|Department of General Surgery, IRCCS San Matteo Foundation, University of Pavia, Piazzale Golgi, Pavia, 27100, Italy. l.cobianchi@smatteo.pv.it.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Cobianchi
authors.affiliation: Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy.|IRCCS Policlinico San Matteo Foundation, General Surgery 1, Pavia, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Peloso
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.
authors.forename: Barbara
authors.initials: B
authors.lastname: Vischioni
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.
authors.forename: Denis
authors.initials: D
authors.lastname: Panizza
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.
authors.forename: Maria Rosaria
authors.initials: MR
authors.lastname: Fiore
authors.affiliation: Department of Radiation Oncology, European Institute of Oncology (IEO), Milan, Italy.
authors.forename: Piero
authors.initials: P
authors.lastname: Fossati
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.
authors.forename: Viviana
authors.initials: V
authors.lastname: Vitolo
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.
authors.forename: Alberto
authors.initials: A
authors.lastname: Iannalfi
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.
authors.forename: Mario
authors.initials: M
authors.lastname: Ciocca
authors.affiliation: IRCCS Policlinico San Matteo Foundation, Department of Onco-Hematology, Oncology Section, Pavia, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Brugnatelli
authors.affiliation: Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy.|IRCCS Policlinico San Matteo Foundation, General Surgery 1, Pavia, Italy.
authors.forename: Tommaso
authors.initials: T
authors.lastname: Dominioni
authors.affiliation: Department of Surgical Science, University of Parma, Parma, Italy.
authors.forename: Dario
authors.initials: D
authors.lastname: Bugada
authors.affiliation: Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy.|IRCCS Policlinico San Matteo Foundation, General Surgery 1, Pavia, Italy.
authors.forename: Marcello
authors.initials: M
authors.lastname: Maestri
authors.affiliation: Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy.|IRCCS Policlinico San Matteo Foundation, General Surgery 1, Pavia, Italy.
authors.forename: Mario
authors.initials: M
authors.lastname: Alessiani
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Valvo
authors.affiliation: Department of Radiation Oncology and Medical Physics, Centro Nazionale Adroterapia Oncologica (CNAO), Pavia, Italy.|Department of Radiation Oncology, European Institute of Oncology (IEO), Milan, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Orecchia
authors.affiliation: Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy.|IRCCS Policlinico San Matteo Foundation, General Surgery 1, Pavia, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Dionigi