The decline in shockable initial rhythm in out of hospital cardiac arrest has levelled of: report from the COSTA group. (September 2019) - de Graaf, Corina; Oving, Iris; Folke, Fredrik; Karlsson, Lena; Kramer-Johansen, Jo; Olasveengen, Theresa; Jonsson, Martin; Ringh, Mattias; Lippert, Freddy; Hulleman, Michiel; Koster, Rudolph; Hollenberg, Jacob; et al.