instruction: what is the number of patients whose discharge location is disc-tran cancer/chldrn h and procedure long title is incision of vessel, abdominal arteries?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.discharge_location = "DISC-TRAN CANCER/CHLDRN H" AND procedures.long_title = "Incision of vessel, abdominal arteries"