1 Department of Medicine, Division of General Internal Medicine, Hypertension Section, Southern Illinois University, 701 N. First St. - Room D442, PO Box 19636, Springfield, IL 62794-9636, USA. Electronic address: Jflack47@siumed.edu.
2 Department of Medicine, Division of General Internal Medicine, Hypertension Section, Southern Illinois University, 701 N. First St. - Room D442, PO Box 19636, Springfield, IL 62794-9636, USA.
3 Department of Medicine, Center for Clinical Research, Southern Illinois University, USA.