1. Department of Emergency Medicine, Stanford University, Stanford, California
2. Stanford University School of Medicine, Stanford, California
3. Dipartimento di Scienze Biomedichee Cliniche “L. Sacco,” Universita' degli Studi di Milano, Milano, Italy
4. Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy
5. Department of Internal Medicine, Humanitas University, Rozzano, Italy