instruction: give me the number of patients whose admission year is less than 2176 and diagnoses short title is late ef-hemplga side nos?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.admityear < "2176" AND diagnoses.short_title = "Late ef-hemplga side NOS"