You may enjoy "Parachute use to prevent death and major trauma when jumping from aircraft: randomized controlled trial" https://www.bmj.com/content/363/bmj.k5

You may enjoy "Parachute use to prevent death and major trauma when jumping from aircraft: randomized controlled trial" https://www.bmj.com/content/363/bmj.k5094 https://www.bmj.com/content/363/bmj.k5094