what was the first procedure time of patient 41393 for spinal tap until 2103?
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 = 'spinal tap' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 41393 ) and strftime('%y',procedures_icd.charttime) <= '2103' order by procedures_icd.charttime asc limit 1