instruction: what is the number of patients diagnosed with other and unspecified angina pectoris who were admitted for more than 13 days in hospital?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.days_stay > "13" AND diagnoses.long_title = "Other and unspecified angina pectoris"