instruction: how many patients whose admission location is phys referral/normal deli and drug code is dilt30?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE demographic.admission_location = "PHYS REFERRAL/NORMAL DELI" AND prescriptions.formulary_drug_cd = "DILT30"