instruction: what is the last time until 10 months ago that patient 031-23724 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 = '031-23724')) AND DATETIME(microlab.culturetakentime) <= DATETIME(CURRENT_TIME(), '-10 month') ORDER BY microlab.culturetakentime DESC LIMIT 1