1. Department of Medicine, The University of Toledo Medical Center, Toledo, OH 43614, USA
2. Department of Gastroenterology and Hepatology, Ascension Providence Hospital, Southfield, MI 43614, USA
3. Department of Medicine, Shaheed Mohtarma Benazir Bhutto University, Larkana, Pakistan
4. Department of Gastroenterology and Hepatology, West Virginia University, Morgantown, WV 26506, USA
5. Department of Internal Medicine, Central Michigan University College of Medicine, Saginaw, MI 48859, USA
6. Division of Gastroenterology, University of San Francisco, SF 94413, USA
7. University of Toledo Libraries, University of Toledo, Toledo, OH 43614, USA
8. Department of Gastroenterology and Hepatology, University of Toledo Medical Center, Toledo, OH 43614, USA
9. Center for Advanced Therapeutic Endoscopy, Porter Adventist Hospital, Center Health, Denver, CO 80210, USA.