1. Division of Cardiology; University of Nebraska Medical Center and Children's Hospital and Medical Center; Omaha Nebraska
2. Department of Congenital Heart Disease/Pediatric Cardiology; German Heart Institute Berlin; Berlin Germany
3. Department of Internal Medicine; Section of Cardiology; University of Nebraska Medical Center; Omaha Nebraska
4. Department of Pharmacology and Experimental Neuroscience; University of Nebraska Medical Center; Omaha Nebraska