Institution: | 1. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA;2. Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, Texas, USA;3. Department of Clinical Sciences, University of Texas Southwestern Medical Center, Dallas, Texas, USA;4. Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA |