Stoecklein HH, Kelly C, Kaji AH, Fantegrossi A, Carlson M, Fix ML, Madsen T, Walls RM, Brown CA. Multicenter Comparison of Nonsupine Versus Supine Positioning During Intubation in the Emergency Department: A National Emergency Airway Registry (NEAR) Study. Acad Emerg Med. 2019 10; 26(10):1144-1151.