1. Division of Cardiothoracic Surgery, University of California at San Francisco (UCSF) Medical Center, San Francisco, CA, USA Division of Cardiothoracic Surgery, UCSF Medical Center, 500 Parnassus Avenue, Suite 405W, Box 0118, San Francisco, CA 94143-0118, USA
2. San Francisco Veterans Affairs Medical Center (SFVAMC), San Francisco, CA, USA