how many times was diphenhydramine prescribed in the last year for patient 65467.
select count(*) from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 65467 ) and prescriptions.drug = 'diphenhydramine' and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-1 year')