when was the first microbiology test of patient 13528, since 149 months ago?
select microbiologyevents.charttime from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 13528 ) and datetime(microbiologyevents.charttime) >= datetime(current_time,'-149 month') order by microbiologyevents.charttime asc limit 1