counts the number of times patient 73713 received a coronar arteriogr-2 cath procedure this year.
select count(*) from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'coronar arteriogr-2 cath' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 73713 ) and datetime(procedures_icd.charttime,'start of year') = datetime(current_time,'start of year','-0 year')