External validation and insights about the calibration of the return of spontaneous circulation after cardiac arrest (RACA) score oleh Lorenzo Gamberini, Chiara Natalia Tartivita, Martina Guarnera, Davide Allegri, Simone Baroncini, Tommaso Scquizzato, Marco Tartaglione, Carlo Alberto Mazzoli, Valentina Chiarini, Cosimo Picoco, Carlo Coniglio, Federico Semeraro, Giovanni Gordini