chronic venous insufficiency chronic venous insufficiency chronic venous insufficiency chronic venous insufficiency Chronic venous insufficiency Chronic venous insufficiency Chronic Venous Insufficiency (CVI) chronic venous insufficiency Chronic venous insufficiency chronic venous insufficiency H hopkinsmedicine.org Chronic Venous Insufficiency. weak vain valves chronic venous insufficiency Venous Insufficiency valves in the vein become faulty chronic venous insufficiency