title: The authors reply.
authors.affiliation: Department of Anesthesiology, RWTH Aachen University, Aachen, Germany;Department of Neurosurgery, RWTH Aachen University, Aachen, Germany, Department of Anesthesiology, RWTH Aachen University, Aachen, Germany.
authors.forename: Mark
authors.initials: M
authors.lastname: Coburn
authors.forename: Anke
authors.initials: A
authors.lastname: Höllig