when was the last time that until 09/2102 patient 3267 was prescribed a medicine via an subcut route?
select prescriptions.startdate from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 3267 ) and prescriptions.route = 'subcut' and strftime('%y-%m',prescriptions.startdate) <= '2102-09' order by prescriptions.startdate desc limit 1