"Association of Prehospital Advanced Airway Management With Neurologic Outcome and Survival in Patients With Out-of-Hospital Cardiac Arrest"
JAMA Jan 21
"Conclusion and Relevance 
Among adult patients with OHCA, any type of advanced airway management was independently associated with decreased odds of neurologically favorable survival compared with conventional bag-valve-mask ventilation."
http://jama.jamanetwork.com/article.aspx?articleid=1557712#qundefined