title: Clock ticking on resident work hours.
authors.affiliation: University of Pennsylvania School of Medicine.
authors.forename: D J
authors.initials: DJ
authors.lastname: Shulkin
authors.forename: A
authors.initials: A
authors.lastname: Giardino
mesh_terms: D000574:American Medical Association; D007396:Internship and Residency; D010561:Personnel Staffing and Scheduling / Q000639:trends*; D014481:United States; D014940:Work Schedule Tolerance