count the number of patients who have been on tpn d9.0 intake until 2103.
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 = 'tpn d9.0' and d_items.linksto = 'inputevents_cv' ) and strftime('%y',inputevents_cv.charttime) <= '2103' ) )