超声心动图E/A值在80岁及以上舒张性心力衰竭患者诊断中的价值
초성심동도E/A치재80세급이상서장성심력쇠갈환자진단중적개치
The value of E/A in echocarodiography in diagnosis of diastolic heart failure in patients aged 80 and over
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