1. Center for Endoscopic Research and Therapeutics, Section of Gastroenterology, Department of Medicine, University of Chicago Medical Center, Chicago, Illinois, USA
2. Department of Biomedical Engineering, McCormick School of Engineering, Northwestern University
3. Department of Health Studies, University of Chicago, Chicago, Illinois, USA
4. Department of Medicine, Technical Institute of Munich
5. Section of Gastroenterology, Department of Medicine, Boston Medical Center, Boston, Massachusetts, USA
6. Department of Surgery, University of Chicago Medical Center, Chicago, Illinois, USA