Cardiac arrest as a reportable condition: a cohort study of the first 6 years of the Norwegian out-of-hospital cardiac arrest registry oleh Eldar Soreide, Alf Inge Larsen, Jørund Langørgen, Ingvild Beathe Myrhaugen Tjelmeland, Kristin Alm-Kruse, Lars-Jøran Andersson, Ståle Bratland, Arne-Ketil Hafstad, Bjørn Haug, Thomas Werner Lindner, Jan Erik Nilsen, Theresa M Olasveengen, Eirik Skogvoll, Jo Kramer-Johansen