1. From the Department of Emergency Medicine, Virginia Commonwealth University, Richmond (J.P.O.); Center for Resuscitation Science, Department of Emergency Medicine, University of Pennsylvania, Philadelphia (L.B.B.); Department of Internal Medicine, The Johns Hopkins University School of Medicine, Baltimore, Md (M.L.W.); Tompkins-McCaw Library for the Health Sciences, Virginia Commonwealth University Libraries, Richmond (B.A.W.).