title: An endangered species.
authors.affiliation: The Division of Cardiothoracic Surgery, University of Colorado Denver, Aurora, CO 80045, USA. David.Fullerton@ucdenver.edu
authors.forename: David A
authors.initials: DA
authors.lastname: Fullerton
mesh_terms: D007396:Internship and Residency; D013903:Thoracic Surgery / Q000193:education / Q000639:trends*; D014481:United States