patient 20713 had undergone any lab tests in 03/last year?
select count(*)>0 from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 20713 ) and datetime(labevents.charttime,'start of year') = datetime(current_time,'start of year','-1 year') and strftime('%m',labevents.charttime) = '03'