1. Gastroenterology and Hepatology Section, Baylor College of Medicine Medical Center, Houston, Texas, United States
2. Division of Gastroenterology, Hepatology and Nutrition, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
3. Division of Gastroenterology, Texas Tech University Health Sciences Center at El Paso, El Paso, Texas, United States
4. US Biotest, Inc., San Luis Obispo, California, United States
5. NanOlogy, LLC., Fort Worth, Texas, United States