title: Letter to the editor.
authors.affiliation: Department of Orthopaedics and Traumatology, University Hospital, Spitalstrasse 21, 4031, Basel, Switzerland.
authors.forename: N
authors.initials: N
authors.lastname: Suhm
authors.affiliation: Department of Emergency Medicine, University Hospital, 4031, Basel, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Bingisser
authors.affiliation: University Center for Medicine of Aging, University of Basel and Felix Platter Hospital, 4055, Basel, Switzerland.
authors.forename: R W
authors.initials: RW
authors.lastname: Kressig
authors.affiliation: University Center for Medicine of Aging, University of Basel and Felix Platter Hospital, 4055, Basel, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Meyer
authors.affiliation: Anesthesiology, University Hospital, 4031, Basel, Switzerland.
authors.forename: L A
authors.initials: LA
authors.lastname: Steiner
authors.affiliation: Anesthesiology, University Hospital, 4031, Basel, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Kopp Lugli
authors.affiliation: Nutrition and Dietetics Service, University Hospital, 4031, Basel, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Kiss
authors.affiliation: Department of Orthopaedics and Traumatology, University Hospital, Spitalstrasse 21, 4031, Basel, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Jakob
authors.affiliation: Department of Orthopaedics and Traumatology, University Hospital, Spitalstrasse 21, 4031, Basel, Switzerland. Niklaus-f.friederich@unibas.ch.
authors.forename: N F
authors.initials: NF
authors.lastname: Friederich