1 Department of Cardiothoracic Surgery, Keck School of Medicine of USC, University of Southern California, 1520 San Pablo St, Ste 4300, Los Angeles, CA 90033.
2 Department of Cardiothoracic Surgery, Keck School of Medicine of USC, University of Southern California, 1520 San Pablo St, Ste 4300, Los Angeles, CA 90033. Electronic address: michael.bowdish@med.usc.edu.