Division of Gastroenterology, University of Washington School of Medicine, Seattle, Washington, United States of America.|Program in Computational Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America.|Program in Computational Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America.|Division of Gastroenterology, University of Washington School of Medicine, Seattle, Washington, United States of America.|University Hospitals Case Medical Center, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America.|University Hospitals Case Medical Center, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America.|Division of Gastroenterology, University of Washington School of Medicine, Seattle, Washington, United States of America.|Program in Computational Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America.