1 Department of Anaesthesiology, University of Groningen, University Medical Center Groningen, PO Box 30 001, 9700 RB, Groningen, The Netherlands. t.w.l.scheeren@umcg.nl.
2 Department of Anesthesiology, Hospital Clínico Universitario, Valencia, Spain.
3 Department of Anesthesiology and Intensive Care, Sheba Medical Center, Tel Aviv University, Tel Aviv, Israel.