instruction: when patient 016-26907 first received a procedure until 3 years ago?
response: SELECT treatment.treatmenttime FROM treatment WHERE treatment.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '016-26907')) AND DATETIME(treatment.treatmenttime) <= DATETIME(CURRENT_TIME(), '-3 year') ORDER BY treatment.treatmenttime LIMIT 1