1 Division of Gastroenterology, Stanford University School of Medicine, Stanford, California; Biodesign Program, Stanford University, Stanford, California. Electronic address: animgaon@stanford.edu.
2 Biodesign Program, Stanford University, Stanford, California; Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California.
3 Biodesign Program, Stanford University, Stanford, California; Department of Surgery, Stanford University School of Medicine, Stanford, California.
4 Division of Gastroenterology, Johns Hopkins School of Medicine, Baltimore, Maryland. Electronic address: ppasric1@jhmi.edu.