1. Department of Anaesthesiology and Intensive Care Medicine; Campus-Virchow-Klinikum and Campus Charité Mitte; Charité - Universitätsmedizin Berlin; Berlin Germany
2. Department of Medical Statistics, Informatics and Documentation; University Hospital Jena; Jena Germany
3. Anaestesiafdelingen; Naestved Sygehus; Naestved Denmark