European Journal of Gastroenterology & Hepatology European Journal of Gastroenterology & Hepatology, 30, 2, pp. 167-173 European Journal of Gastroenterology & Hepatology, 30, 167-173 European Journal of Gastroenterology and Hepatology, 30(2), 167-173 European Journal of Gastroenterology and Hepatology, 30(2), 167. Lippincott Williams and Wilkins