when was the first time that patient 52598 was prescribed with epinephrine until 01/2104?
select prescriptions.startdate from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 52598 ) and prescriptions.drug = 'epinephrine' and strftime('%y-%m',prescriptions.startdate) <= '2104-01' order by prescriptions.startdate asc limit 1