instruction: how many patients have undergone wound care until 1 year ago in the same month after the first procedure of a antiarrhythmics - class iv antiarrhythmic?
response: SELECT COUNT(DISTINCT t1.uniquepid) FROM (SELECT patient.uniquepid, treatment.treatmenttime FROM treatment JOIN patient ON treatment.patientunitstayid = patient.patientunitstayid WHERE treatment.treatmentname = 'antiarrhythmics - class iv antiarrhythmic' AND DATETIME(treatment.treatmenttime) <= DATETIME(CURRENT_TIME(), '-1 year')) AS t1 JOIN (SELECT patient.uniquepid, treatment.treatmenttime FROM treatment JOIN patient ON treatment.patientunitstayid = patient.patientunitstayid WHERE treatment.treatmentname = 'wound care' AND DATETIME(treatment.treatmenttime) <= DATETIME(CURRENT_TIME(), '-1 year')) AS t2 WHERE t1.treatmenttime < t2.treatmenttime AND DATETIME(t1.treatmenttime, 'start of month') = DATETIME(t2.treatmenttime, 'start of month')