what is the monthly maximum amount of wbc of patient 95235 since 04/2102?
select max(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 95235 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'wbc' ) and strftime('%y-%m',labevents.charttime) >= '2102-04' group by strftime('%y-%m',labevents.charttime)