18669intestinal diseasesPT0000-00-00 00:00:00BT18668gastrointestinal diseasesPTNT18686appendicitisPTNT18708colitisPTNT18682duodenal obstructionPTNT18672intestinal fistulaPTNT18673intestinal obstructionPTNT18674intestinal perforationPTRT18654intestinesPT