1. Division of Cardiology; Duke University Medical Center; Durham; North Carolina; USA
2. Department of Biomedical Sciences; University of Missouri; Columbia; Missouri; USA
3. Department of Internal Medicine; University of Missouri; Columbia; Missouri; USA
4. Department of Nutrition and Exercise Physiology; University of Missouri; Columbia; Missouri; USA
5. Department of Pediatrics; University of Arkansas for Medical Sciences; Little Rock; Arkansas; USA