what is patient 13806's minimum uric acid, urine value since 108 months ago?
select min(labevents.valuenum) from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 13806 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'uric acid, urine' ) and datetime(labevents.charttime) >= datetime(current_time,'-108 month')