title: Annals of emergency medicine journal club: frequent fliers, internal and external validity, and problems with making continuous variables binary answers to the may 2009 journal club questions.
authors.affiliation: Department of Emergency Medicine, Keck School of Medicine/University of Southern California, Los Angeles, CA.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Arora
authors.forename: David L
authors.initials: DL
authors.lastname: Schriger