###HUMAN: how many patients were prescribed 10 ml vial : calcium chloride 10 % iv soln during the same month after the diagnosis of sinus tachycardia, since 4 years ago?, ###ASSISTANT: SELECT COUNT(DISTINCT t1.uniquepid) FROM (SELECT patient.uniquepid, diagnosis.diagnosistime FROM diagnosis JOIN patient ON diagnosis.patientunitstayid = patient.patientunitstayid WHERE diagnosis.diagnosisname = 'sinus tachycardia' AND DATETIME(diagnosis.diagnosistime) >= DATETIME(CURRENT_TIME(), '-4 year')) AS t1 JOIN (SELECT patient.uniquepid, medication.drugstarttime FROM medication JOIN patient ON medication.patientunitstayid = patient.patientunitstayid WHERE medication.drugname = '10 ml vial : calcium chloride 10 % iv soln' AND DATETIME(medication.drugstarttime) >= DATETIME(CURRENT_TIME(), '-4 year')) AS t2 WHERE t1.diagnosistime < t2.drugstarttime AND DATETIME(t1.diagnosistime, 'start of month') = DATETIME(t2.drugstarttime, 'start of month')