1. Division of Cardiothoracic Surgery; David Geffen School of Medicine at UCLA; 62-258 CHS, 10833 Le Conte Avenue Los Angeles CA 90095 USA
2. University of Alabama; Birmingham AL USA
3. Drexel University; Philadelphia PA USA
4. Albert-Ludwigs-Universitat-Freiburg; Freiburg Germany
5. Johns Hopkins University; Baltimore MD USA
6. The Valley Hospital; Ridgewood NJ USA