1. Division of Gastroenterology, University of Tennessee Health Science Center, Memphis, TN, USA
2. Division of Gastroenterology, University of Alabama at Birmingham, Birmingham, AL, USA
3. Mulford Medical Sciences Library, University of Toledo, Toledo, OH, USA
4. Department of Medicine, University of Toledo, Toledo, OH, USA
5. Division of Gastroenterology, William Beaumont Hospital, Royal Oak, MI, USA
6. Department of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
7. Division of Gastroenterology, Geisinger Medical Center, Danville, PA, USA