Methods Examine the two village people,including table,enregister,kensa,draw 12-lead electrocardiogram,X-ray from 2 meters distances and calculate the heart and chest rate.

• 方法对两村居民进行检诊,包括制表、登记、查体、描记12导联心电图,对病人及疑似病人拍摄2m后前位X线胸片,测定并计算心胸比率。