Knudsen , K., U. Pöder, U. Nilsson, M. Högman, A. Larsson, and J. Larsson. “How Anaesthesiologists Understand Difficult Airway guidelines—an Interview Study”. Upsala Journal of Medical Sciences, vol. 122, no. 4, Jan. 2018, pp. 243–248, doi:10.1080/03009734.2017.1406020.