1. Department of Internal Medicine, Paul L. Foster School of Medicine, Texas Tech University Health Science Center, El Paso, TX, USA
2. Department of Pathology, Paul L. Foster School of Medicine, Texas Tech University Health Science Center, El Paso, TX, USA
3. Department of Surgery, Paul L. Foster School of Medicine, Texas Tech University Health Science Center, El Paso, TX, USA
4. Department of Internal Medicine, Division of Gastroenterology, Paul L. Foster School of Medicine, Texas Tech University Health Science Center, El Paso, TX, USA