instruction: how many patients admitted before 2127 have been diagnosed with atherosclerosis of native arteries of the extremities with intermitted claudication?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.admityear < "2127" AND diagnoses.short_title = "Ath ext ntv at w claudct"