how many patients until 2104 were prescribed with iso-osmotic dextrose during the same month after they were diagnosed with adv eff antibiotics nec?
select count( distinct t1.subject_id ) from ( select admissions.subject_id, diagnoses_icd.charttime from diagnoses_icd join admissions on diagnoses_icd.hadm_id = admissions.hadm_id where diagnoses_icd.icd9_code = ( select d_icd_diagnoses.icd9_code from d_icd_diagnoses where d_icd_diagnoses.short_title = 'adv eff antibiotics nec' ) and strftime('%y',diagnoses_icd.charttime) <= '2104' ) as t1 join ( select admissions.subject_id, prescriptions.startdate from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where prescriptions.drug = 'iso-osmotic dextrose' and strftime('%y',prescriptions.startdate) <= '2104' ) as t2 on t1.subject_id = t2.subject_id where t1.charttime < t2.startdate and datetime(t1.charttime,'start of month') = datetime(t2.startdate,'start of month')