Carr Brendan G, Conway Patrick H, Meisel Zachary F, Steiner Claudia A, Clancy Carolyn
Department of Emergency Medicine and the Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, PA 19104-6021, USA.
Ann Emerg Med. 2010 Jul;56(1):49-51. doi: 10.1016/j.annemergmed.2009.12.013. Epub 2010 Jan 4.