Methods 103 cases of PDA were treated through different interventional therapy, 52 through the arteriovenous double approach, 51 through the single venous approach(14 angiography and 37 ultrasound).

A novel approach that USES both heat and light from the sun to make electricity could potentially double the output of solar panels (a New Way to use the sun's Energy).

So if the goal of double-checked locking is supposed to offer improved performance over a more straightforward synchronized approach, this "fixed" version doesn't help very much either.