instruction: what is the number of patients discharged to skilled nursing facility who had incision of vessel, lower limb arteries?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.discharge_location = "REHAB/DISTINCT PART HOSP" AND procedures.long_title = "Incision of vessel, lower limb arteries"