1. Division of Cardiology; University of Florida College of Medicine; Jacksonville Florida USA
2. Division of Cardiology; University of Colorado School of Medicine; Aurora Colorado USA
3. Division of Cardiology; University of Rochester School of Medicine; Rochester New York USA
4. Division of Cardiology; John Hopkins University School of Medicine; Baltimore Maryland USA
5. Division of Cardiology; Tufts University School of Medicine; Boston Massachusetts USA
6. Division of Cardiology; University of British Columbia; Vancouver British Columbia Canada
7. Division of Cardiology; University of Arizona College of Medicine; Tucson Arizona USA
8. Division of Pediatrics; University of Tennesse; Memphis Tennessee USA