title: Reply.
authors.affiliation: Department of Cardiothoracic Surgery, University of Pittsburgh Medical Center, 200 Lothrop St, Ste C-800, Pittsburgh, PA15213.
authors.forename: Ryan A
authors.initials: RA
authors.lastname: Macke
authors.affiliation: Department of Cardiothoracic Surgery, University of Pittsburgh Medical Center, 200 Lothrop St, Ste C-800, Pittsburgh, PA15213.
authors.forename: James D
authors.initials: JD
authors.lastname: Luketich
authors.affiliation: Department of Cardiothoracic Surgery, University of Pittsburgh Medical Center, 200 Lothrop St, Ste C-800, Pittsburgh, PA15213. Electronic address: pennathura@upmc.edu.
authors.forename: Arjun
authors.initials: A
authors.lastname: Pennathur
authors.affiliation: Department of Cardiothoracic Surgery, University of Pittsburgh Medical Center, 200 Lothrop St, Ste C-800, Pittsburgh, PA15213.
authors.forename: Ryan M
authors.initials: RM
authors.lastname: Levy