1. Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
2. Department of Internal Medicine, Division of Nephrology, Mayo Clinic, Rochester, MN, USA
3. Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
4. Department of Internal Medicine, Division of Cardiology, Texas Tech University Health Sciences Center, Lubbock, TX, USA