when was the last time in 2105 that patient 4900 received a endo emb hd/nk,bare coil treatment?
select procedures_icd.charttime from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'endo emb hd/nk,bare coil' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 4900 ) and strftime('%y',procedures_icd.charttime) = '2105' order by procedures_icd.charttime desc limit 1