instruction: find the number of patients with procedure icd9 code 3961 who were discharged to inpatient hospital.
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.icd9_code = "3961"