1. Department of General Internal Medicine; Erasme Hospital; Université libre de Bruxelles; Brussels; Belgium
2. Department of Anesthesiology and Intensive Care; Friedrich-Schiller University; Jena; Germany
3. Department of Intensive Care; Swiss Paraplegic centre; Nottwil; Switzerland
4. Department of Anesthesiology and Intensive Care Medicine; Kreiskrankenhaus Mechernich and University of Bonn; Mechernich; Germany
5. Department of Intensive Care; Erasmus Medical Center; Rotterdam; The Netherlands
6. Department of Intensive Care; Erasme Hospital; Université Libre de Bruxelles; Brussels; Belgium