1 Department of Gastroenterology, The Permanente Medical Group, Kaiser Permanente Northern California, Santa Clara, California; Division of Research, Kaiser Permanente Northern California, Oakland, California.
2 Division of Gastroenterology, University of California, San Diego; Gastroenterology Section, VA San Diego Healthcare System, San Diego, California.
3 Division of Research, Kaiser Permanente Northern California, Oakland, California; Department of Gastroenterology, The Permanente Medical Group, Kaiser Permanente Northern California, San Francisco, California.