instruction: what is the number of patients whose procedure icd9 code is 9465 and drug route is sl?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE procedures.icd9_code = "9465" AND prescriptions.route = "SL"