Guy V Cammu1, Lore R Klewais1,2, Dirk M Vandeput1, Luc A Foubert1. 1. Anaesthesiology, Critical Care and Emergency Medicine, Onze-Lieve-Vrouw Ziekenhuis, Aalst, Belgium. 2. Department of Anaesthesiology and Pain Medicine, University Hospital, Leuven, Belgium.