[1] Univ Roma La Sapienza, St Andrea Hosp, Fac Med & Psychol Medical Surg Sci & Translat Med, Dept Emergency Med, I-00189 Rome, Italy
[2] SUNY Downstate Kings Cty Hosp Med Ctr, Dept Emergency Med, Brooklyn, NY 11203 USA
[3] Northwest London Collaborat Leadership Appl Hlth, Dept Med, London, England
[4] S Giovanni Addolorata Hosp, Dept Emergency Med, I-00184 Rome, Italy