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Comparison of laparoscopic radiofrequency ablation with percutaneous radiofrequency ablation in the treatment of chronic hepatitis B-related hepatocellular carcinoma involving specific sites: A ...

The valves make sure blood flows in only one direction. The aortic valve keeps blood flowing from the left ventricle to the aorta. Your child may be born with aortic stenosis (congenital). Or it may ...