what is the number of patients who had been diagnosed with comp-oth cardiac device since 2105?
select count( distinct admissions.subject_id ) from admissions where admissions.hadm_id in ( select diagnoses_icd.hadm_id from diagnoses_icd where diagnoses_icd.icd9_code = ( select d_icd_diagnoses.icd9_code from d_icd_diagnoses where d_icd_diagnoses.short_title = 'comp-oth cardiac device' ) and strftime('%y',diagnoses_icd.charttime) >= '2105' )