calculate the number of times patient 94757 had received a albumin, urine laboratory test since 03/2104.
select count(*) from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'albumin, urine' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 94757 ) and strftime('%y-%m',labevents.charttime) >= '2104-03'