instruction: how many patients having phys referral/normal deli as the admission location have diagnosis icd9 code 49122?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.admission_location = "PHYS REFERRAL/NORMAL DELI" AND diagnoses.icd9_code = "49122"