Importance of reporting survival as incidence: a cross-sectional comparative study on out-of-hospital cardiac arrest registry data from Germany and Norway oleh Ingvild Beathe Myrhaugen Tjelmeland, Kristin Alm-Kruse, Jo Kramer-Johansen, Jan-Thorsten Gräsner, Stephan Seewald, Cecilie Benedicte Isern, Barbara Jakisch, Niels Renzing, Jan Wnent