what is the number of patients who have had a 1:1 ns repletion. intake since 1 year ago?
select count( distinct admissions.subject_id ) from admissions where admissions.hadm_id in ( select icustays.hadm_id from icustays where icustays.icustay_id in ( select inputevents_cv.icustay_id from inputevents_cv where inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = '1:1 ns repletion.' and d_items.linksto = 'inputevents_cv' ) and datetime(inputevents_cv.charttime) >= datetime(current_time,'-1 year') ) )