1. School of Medicine, The University of Texas Rio Grande Valley, Edinburg, Texas, USA
2. Internal Medicine Residency Program, University of Texas Rio Grande Valley, Edinburg, Texas, USA
3. Doctors Hospital at Renaissance, Edinburg, Texas, USA
4. South Texas Infectious Disease Consultants, McAllen, Texas, USA
5. Pulmonary and Sleep Center of the Valley, McAllen, Texas, USA