when was the last hospital admission time when patient 9299 was admitted via an transfer from hosp/extram since 4 years ago?
select admissions.admittime from admissions where admissions.subject_id = 9299 and admissions.admission_location = 'transfer from hosp/extram' and datetime(admissions.admittime) >= datetime(current_time,'-4 year') order by admissions.admittime desc limit 1