Pines Jesse M, Yealy Donald M
Department of Emergency Medicine and Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania School of Medicine, and the Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, PA, USA.
Ann Emerg Med. 2009 Oct;54(4):511-3. doi: 10.1016/j.annemergmed.2009.05.023. Epub 2009 Jul 2.