what was the name of the organism that was found during the last swab test of patient 62983 until 29 months ago?
select microbiologyevents.org_name from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 62983 ) and microbiologyevents.spec_type_desc = 'swab' and microbiologyevents.org_name is not null and datetime(microbiologyevents.charttime) <= datetime(current_time,'-29 month') order by microbiologyevents.charttime desc limit 1