1. Department of Medicine, University of Texas Health science center, San Antonio, TX, USA
2. Department of Gastroenterology, Bethany Medical Center, Winston-Salem, NC, USA
3. Division of Gastroenterology, Texas Tech University Health Sciences Center, El Paso, TX, USA
4. Department of Gastroenterology, University of New Mexico School of Medicine, Albuquerque, NM, USA
5. Paul L. Foster School of Medicine (PLFSOM), Texas Tech University Health Sciences Center El Paso, El Paso, TX, USA
6. Department of Gastroenterology, University of Texas Health Science Center at San Antonio, TX, USA