Pre-hospital advanced airway management for adults with out-of-hospital cardiac arrest: nationwide cohort study BMJ 2019; 364 Junichi Izawa, Sho Komukai, Koichiro Gibo, Masashi Okubo, Kosuke Kiyohara, Chika Nishiyama, Takeyuki Kiguchi, Tasuku Matsuyama, Takashi Kawamura, Taku Iwami, Clifton W Callaway, Tetsuhisa Kitamura