what's patient 6536's minimum value of atypical lymphocytes since 02/2103?
select min(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 6536 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'atypical lymphocytes' ) and strftime('%y-%m',labevents.charttime) >= '2103-02'