1. Department of Intensive Care and Emergency Unit, Ospedale Civile, Voghera, Italy
2. Division of Neurology, Ospedale Civile.
3. 2nd Department of Anaesthesiology and Critical Care Medicine, Fondazione IRCCS Policlinico S. Matteo, Pavia.
4. Department of Neurology, Columbia University Medical Center, New York, United States of America.