what is the difference between patient 30044's total number of inputs and outputs until 86 days ago?
select ( 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 = 30044 ) ) and datetime(inputevents_cv.charttime) <= datetime(current_time,'-86 day') ) - ( select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 30044 ) ) and datetime(outputevents.charttime) <= datetime(current_time,'-86 day') )