###HUMAN: How many patients admitted as clinic referral (premature) were diagnosed with percutaneous transluminal coronary angioplasty status?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.admission_location = "CLINIC REFERRAL/PREMATURE" AND diagnoses.long_title = "Percutaneous transluminal coronary angioplasty status"