1 Department of Anesthesia and Intensive Care Medicine, Medical University Innsbruck, Anichstraße 35, A-6020 Innsbruck, Austria.
2 Department of Obstetrics & Gynecology, Medical University of Graz, Auenbruggerplatz 14, 8036 Graz, Austria.
3 Department of Anesthesia and Intensive Care Medicine, Medical University Innsbruck, Anichstraße 35, A-6020 Innsbruck, Austria. Electronic address: [email protected].
4 Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University, School of Medicine, Palo Alto, CA 94305, USA.