1. Alpert Medical School of Brown University, Providence, RI, USA
2. Division of Dermatology, Alpert Medical School of Brown University, Providence, RI, USA
3. Division of Gastroenterology, Department of Medicine, Alpert Medical School of Brown University, Providence, RI, USA
4. Division of Diagnostic Imaging, Alpert Medical School of Brown University, Providence, RI, USA
5. Division of Medical Education, Alpert Medical School of Brown University, Providence, RI, USA