instruction: when has patient 031-16123 until 09/2104 for the first time received a microbiology test?
response: SELECT microlab.culturetakentime FROM microlab WHERE microlab.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '031-16123')) AND STRFTIME('%y-%m', microlab.culturetakentime) <= '2104-09' ORDER BY microlab.culturetakentime LIMIT 1