instruction: how many patients below 71 years of age are diagnosed with procedures as the cause of abnormal reaction of patient, or of later complication, without mention of misadventure at time of procedure?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.age < "71" AND diagnoses.long_title = "Other specified procedures as the cause of abnormal reaction of patient, or of later complication, without mention of misadventure at time of procedure"