since 70 months ago, what was the daily minimum value of the wbc casts of patient 14458?
select min(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 14458 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'wbc casts' ) and datetime(labevents.charttime) >= datetime(current_time,'-70 month') group by strftime('%y-%m-%d',labevents.charttime)