instruction: give the number of patients whose admission locations is trsf within this facility and who were given the drug cetylpyridinum chl (cepacol).
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE demographic.admission_location = "TRSF WITHIN THIS FACILITY" AND prescriptions.drug = "Cetylpyridinium Chl (Cepacol)"