1 Department of Cardiothoracic Surgery, Stanford University Medical Center, Stanford, California, United States. Electronic address: [email protected].
2 Department of Cardiothoracic Surgery, Stanford University Medical Center, Stanford, California, United States.
3 Department of Cardiothoracic Surgery, Stanford University Medical Center, Stanford, California, United States; Department of Cardiothoracic Surgery, Veterans Affairs Palo Alto Health Care System, Palo Alto, California, United States.