American Journal of Gastroenterology, 114(9), 1512-1519. Springer Nature American journal of gastroenterology, 114(9), 1512-1519. Springer Nature American Journal of Gastroenterology, 114, 1512-1519 American Journal of Gastroenterology, 114, 9, pp. 1512-1519 AMERICAN JOURNAL OF GASTROENTEROLOGY, 114(9), 1512-1519. LIPPINCOTT WILLIAMS & WILKINS