title: Outcomes of primary care patients who are frequent and persistent users of the ED.
authors.affiliation: Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA. Electronic address: ahwang1@partners.org.
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Hwang
authors.affiliation: Department of Emergency Medicine, Massachusetts General Hospital, Boston, MA.
authors.forename: Shan W
authors.initials: SW
authors.lastname: Liu
authors.affiliation: Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA.
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Ashburner
authors.affiliation: Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA.
authors.forename: Brandon J
authors.initials: BJ
authors.lastname: Auerbach
authors.affiliation: Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Atlas
authors.affiliation: Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA.
authors.forename: Clemens S
authors.initials: CS
authors.lastname: Hong
mesh_terms: D015331:Cohort Studies; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D000069342:Medical Overuse; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011320:Primary Health Care; D012959:Socioeconomic Factors