1. Vascular Biology and Hypertension Program, Division of Cardiovascular Disease, University of Alabama at Birmingham, AL
2. Endocrine Hypertension Research Center and Clinical Center of Research Excellence in Cardiovascular Disease and Metabolic Disorders, University of Queensland School of Medicine, Princess Alexandra and Greenslopes Hospitals, Brisbane, QLD, Australia
3. Sleep/Wake Disorders Center, Division of Pulmonary, Allergy and Critical Care Medicine, University of Alabama at Birmingham, AL
4. Department of Biostatistics, University of Alabama at Birmingham, AL