title: Annals of Emergency Medicine Journal Club. Journal club: Frequent fliers, internal and external validity, and the problem with making continuous variables binary.
authors.affiliation: Department of Emergency Medicine, Keck School of Medicine/ University of Southern California, Los Angeles, CA, USA.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Arora
authors.forename: David L
authors.initials: DL
authors.lastname: Schriger