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Glance LG, Osler TM, Mukamel DB, Dick AW. Impact of trauma center designation on outcomes: is there a difference between Level I and Level II trauma centers? J Am Coll Surg. 2012 Sep;215(3):372-8.

Ellen J. MacKenzie, Ph.D., Frederick P. Rivara, M.D., M.P.H., Gregory J. Jurkovich, M.D., Avery B. Nathens, M.D., Ph.D., Katherine P. Frey, M.P.H., Brian L. Egleston, M.P.P., David S. Salkever, Ph.D., and Daniel O. Scharfstein, Sc.D. A National Evaluation of the Effect of Trauma-Center Care on Mortality N Engl J Med 2006; 354:366-378 January 26, 2006 DOI: 10.1056/NEJMsa052049