By Igor Paulussen, Philips Research, Eindhoven (NL), Department of Anaesthesiology, Resuscitation and Pain Management, Elisabeth-TweeSteden Hospital, Tilburg, The Netherlands, i.paulussen@etz.nl | Frederick Callebaut, Department of Anaesthesiology, Resuscitation and Pain Management, Elisabeth-TweeSteden Hospital, Tilburg, The Netherlands, f.callebaut@etz.nl | Gerrit Jan Noordergraaf, Elisabeth-TweeSteden Hospital, Tilburg, The Netherlands, g.noordergraaf@gmail.com