1. Department of Internal Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, Texas
2. Division of Cardiovascular Medicine, Department of Internal Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, Texas
3. Paul L. Foster School of Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, Texas
4. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, Texas