what was the name of the organism found in the microbiology test of the last throat culture of patient 4469 since 168 months ago?
select microbiologyevents.org_name from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 4469 ) and microbiologyevents.spec_type_desc = 'throat culture' and microbiologyevents.org_name is not null and datetime(microbiologyevents.charttime) >= datetime(current_time,'-168 month') order by microbiologyevents.charttime desc limit 1