id	keyword
easat-4517	gallstone
easat-4517	ileus
easat-4517	obstruction
easat-4517	vol
easat-4517	enterolithotomy
easat-4517	patient
easat-4517	gallstone ileus
easat-4517	procedure
easat-4517	surgery
easat-4517	fistula
easat-4517	stage