title: Variation in Cohorts Derived from EHR Data in Four Care Delivery Settings.
authors.affiliation: Intermountain Healthcare, Salt Lake City, UT.
authors.forename: Susan
authors.initials: S
authors.lastname: Rea
authors.affiliation: Mayo Clinic, Rochester, MN.
authors.forename: Kent R
authors.initials: KR
authors.lastname: Bailey
authors.affiliation: Mayo Clinic, Rochester, MN.
authors.forename: Jyotishman
authors.initials: J
authors.lastname: Pathak
authors.affiliation: Intermountain Healthcare, Salt Lake City, UT.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Haug