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.