calculate how many times potassium chloride replacement (oncology) was prescribed to patient 76372 during this month.
select count(*) from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 76372 ) and prescriptions.drug = 'potassium chloride replacement (oncology)' and datetime(prescriptions.startdate,'start of month') = datetime(current_time,'start of month','-0 month')