title: Erratum to: Effect of augmentation techniques on the failure of pedicle screws under cranio-caudal cyclic loading.
authors.affiliation: Department of Neurosurgery, University Hospital of Duesseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany, richard.bostelmann@med.uni-duesseldorf.de.
authors.forename: Richard
authors.initials: R
authors.lastname: Bostelmann
authors.forename: Alexander
authors.initials: A
authors.lastname: Keiler
authors.forename: Hans Jakob
authors.initials: HJ
authors.lastname: Steiger
authors.forename: Armin
authors.initials: A
authors.lastname: Scholz
authors.forename: Jan Frederick
authors.initials: JF
authors.lastname: Cornelius
authors.forename: Werner
authors.initials: W
authors.lastname: Schmoelz