calculate the number of times that patient 57050 had produced peg tail flush in 12/this year.
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 = 57050 ) ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'peg tail flush' and d_items.linksto = 'outputevents' ) and datetime(outputevents.charttime,'start of year') = datetime(current_time,'start of year','-0 year') and strftime('%m',outputevents.charttime) = '12'