Reality matters: in-field validation of fresh frozen cadaver-based airway training in HEMS - the BOAH Initiative: a prospective observational cohort study - Sebastian Imach; Tobias Ahnert; Sarah Krueger; Mai Bui; Bernd A. Leidel; Jenny Patricia Kehrberger; Michael Kemper; Benny Kölbel (BMC Emergency Medicine, 2026)