1 Department of Clinical Sciences, University of Houston College of Medicine, Houston, Tex; Houston Heart, HCA Houston Healthcare, Houston, Tex.
2 Department of Clinical Sciences, University of Houston College of Medicine, Houston, Tex; Houston Heart, HCA Houston Healthcare, Houston, Tex; HCA Research Institute, Nashville, Tenn.
3 Department of Clinical Sciences, University of Houston College of Medicine, Houston, Tex; Houston Heart, HCA Houston Healthcare, Houston, Tex. Electronic address: krajago2@central.uh.edu.