1 Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, 1959 NE Pacific Street, Box 356424, Seattle, WA, 98195-6424, USA. [email protected].
2 Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, 1959 NE Pacific Street, Box 356424, Seattle, WA, 98195-6424, USA.