1. School of Medicine, University of Texas at Tyler, Tyler, TX 75708, USA
2. Division of Infectious Diseases, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
3. HCA Houston Healthcare, Kingwood, TX 77339, USA
4. School of Public Health, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
5. School of Medicine, University of Texas Medical Branch, Galveston, TX 77555, USA
6. School of Interdisciplinary Arts and Sciences, University of Washington Bothell, Bothell, WA 98011, USA