西地那非联合低分子肝素钙治疗慢性阻塞性肺病合并肺心病的疗效观察
서지나비연합저분자간소개치료만성조새성폐병합병폐심병적료효관찰
The curative effect observation of sildenafil combined low molecular heparin calcium treatment for chronic obstructive pulmonary disease (COPD) with cor pulmonal
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