1. Department of Anaesthesiology; Intensive Care Medicine and Pain Therapy; Diako Hospital, Flensburg, Academic Teaching Hospital of the University of Kiel; Germany
2. Department of Anaesthesiology and Intensive Care Medicine; Hospital de Manacor; Mallorca; Spain
3. Department of Anaesthesiology; Intensive Care Medicine; Pain Therapy and Palliative Care; Knappschaftskrankenhaus, Ruhr University; Bochum; Germany