instruction: count the number of times that patient 8016 has produced ostomies ileostomy during the previous month.
response: SELECT COUNT(*) FROM outputevents WHERE outputevents.icustay_id IN (SELECT icustays.icustay_id FROM icustays WHERE icustays.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 8016)) AND outputevents.itemid IN (SELECT d_items.itemid FROM d_items WHERE d_items.label = 'ostomies ileostomy' AND d_items.linksto = 'outputevents') AND DATETIME(outputevents.charttime, 'start of month') = DATETIME(CURRENT_TIME(), 'start of month', '-1 month')