1. Department of Anaesthesiology and Intensive Care, Philipps-Universität Marburg, Marburg, Germany;
2. Clinic for Intensive Care, Emergency Medicine and Pain Therapy, Klinikum Ludwigsburg, Ludwigsburg, Germany;
3. ratiopharm GmbH, Ulm, Germany;
4. Teva GmbH, Berlin, Germany;
5. ACOMED statistik, Leipzig, Germany;
6. Department of Anaesthesia and Critical Care, University Hospital Würzburg, Würzburg, Germany