DUODENOGASTRIC REFLUX AND HISTOPATHOLOGICAL CHANGES IN GASTRIC AND DUODENAL MUCOSA IN PATIENTS WHO UNDERWENT CHOLECYSTECTOMY - YAZICIOĞLU, Nafi; GÖNENÇ, Uğur; KARAOĞLU, Ali Önder; ÜNSAL, Belkıs; KARACA, Himmet; KOŞAY, Sadun (Turkish Journal of Gastroenterology, 1994)