非体外循环冠脉搭桥术前后肺静脉血流的经食管超声研究
비체외순배관맥탑교술전후폐정맥혈류적경식관초성연구
Study on Pulmonary Venous Flow Before and After Off-pump Coronary Artery Bypass with Transesophageal Echocardiography
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