1. Dipartimento di Anestesia e Terapie Intensive, Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy
2. Cardiac Intensive Care, Heart and Vascular Center, Semmelweis University, Budapest, Hungary
3. Critical Care Proprietary Products, CO, Orion Pharma, PO Box 65, FIN-02101 Espoo, Finland
4. Intensive Care Department, Consorci Sanitari Integral, University of Barcelona, Barcelona, Spain