1. Department of Emergency Medicine, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Rome, Italy
2. Foundation “Ospedale Alba-Bra” and Department of Anesthesia, Critical Care and Emergency Medicine, Michele and Pietro Ferrero Hospital, Verduno, Italy
3. Department of Anesthesiology and Perioperative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
4. Department of Gastroenterology, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Rome, Italy.