Reply to Drs Johnston and Sondekoppam

Thomas Fichtner Bendtsen¹, Bernhard Moriggl, Vincent Chan+1

• ¹Department of Anesthesia, Aarhus University Hospital, Aarhus, Denmark Division of Clinical and Functional Anatomy, Medical University of Innsbruck, Innsbruck, Austria Department of Anesthesia, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada Department of Anesthesia, Zealand University Hospital, University of Copenhagen, Copenhagen, Denmark.