1 Department of Anesthesiology, University Medical Center Groningen University of Groningen, Groningen, The Netherlands, d.j.eleveld@umcg.nl Departmento de Anestesiología, Escuela de Medicina Pontificia Universidad Católica de Chile, Santiago, Chile Department of Anesthesiology, University Medical Center Groningen University of Groningen, Groningen, The Netherlands, Department of Anesthesia, Ghent University, Ghent, Belgium.