title: The problem of cross-over design in airway studies.
authors: R
authors: R
authors: Greif
authors: L
authors: L
authors: Theiler
mesh_terms: D018592:Cross-Over Studies; D006801:Humans; D007441:Intubation, Gastrointestinal / Q000379:methods; D017214:Laryngeal Masks; D012107:Research Design