1. Geisinger Commonwealth School of Medicine, Scranton, Pennsylvania, USA
2. Department of Internal Medicine, Geisinger Wyoming Valley Medical Center, Wilkes Barre, Pennsylvania, USA
3. Department of Clinical and Laboratory Pathology, Geisinger Medical Center, Danville, Pennsylvania, USA
4. Department of Internal Medicine, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
5. Department of Gastroenterology, Geisinger Community Medical Center, Scranton, Pennsylvania, USA