左西孟旦联合西地那非治疗慢性心力衰竭肺动脉高压的疗效观察
좌서맹단연합서지나비치료만성심력쇠갈폐동맥고압적료효관찰
Efficacy of sildenafil combined with levosimendan on patients with chronic heart failure and pulmonary hypertension
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