instruction: provide the number of patients whose year of birth is less than 2101 and procedure short title is oth uni salpingo-oophor?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.dob_year < "2101" AND procedures.short_title = "Oth uni salpingo-oophor"