Return of Spontaneous Circulation (ROSC) in Out-of Hospital Cardiac Arrest (OHCA) and type of bystanders (lay/health personnel): The 2015 analysis of the provincial "Out-of-Hospital Cardiac Arrest Registry" of the emergency medical system "Trentino Emergenza" in the Autonomous Province of Trento (Italy). (September 2016) - Gentilini, Maria Adalgisa