what is the total d5w w/20gm cagluc intake until 752 days ago that patient 16879 has received?
select sum(inputevents_cv.amount) from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 16879 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'd5w w/20gm cagluc' and d_items.linksto = 'inputevents_cv' ) and datetime(inputevents_cv.charttime) <= datetime(current_time,'-752 day')