how many patients have received a total protein, urine lab test since 2104?
select count( distinct admissions.subject_id ) from admissions where admissions.hadm_id in ( select labevents.hadm_id from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'total protein, urine' ) and strftime('%y',labevents.charttime) >= '2104' )