1. Department of Medicine, Section of Cardiology, Univ. of Oklahoma Health Center, Oklahoma City, OK, USA
2. CMRI Metabolic Research Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
3. Section of General Internal Medicine Univ. of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
4. CMRI Metabolic Research Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA, andrew-gardner@ ouhsc.edu