Matthias Kreuzer1, Gerhard Schneider, Paul S García. 1. Department of Anesthesiology, Emory University, Atlanta, Georgia, Research Service, Atlanta VA Medical Center, Atlanta, Georgia Department of Anaesthesiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany Department of Anesthesiology, Emory University, Atlanta, Georgia, Research Service, Atlanta VA Medical Center, Atlanta, Georgia.