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"Variable Name","Variable ID","Variable Description",Version,"dbGaP Mapping" PX040501_ECG_Examination_Date,PX040501020100,"Date of Electrocardiogram (ECG) Examination (mm/dd/yyyy).",0,https://www.phenxtoolkit.org/protocols/view/40501 PX040501_ECG_Image_ID,PX040501020200,"Electrocardiogram Trace/Image ID.",0,https://www.phenxtoolkit.org/protocols/view/40501 PX040501_Ever_Have_Heart_Valve_Problem,PX040501010000,"Has a doctor ever told you that you had rheumatic heart disease or heart valve problems?",0,https://www.phenxtoolkit.org/protocols/view/40501