"Parachute use to prevent death and major trauma when jumping from aircraft: randomized controlled trial" (2018) <https://www.bmj.com/content/363/bmj.k5094 htt

"Parachute use to prevent death and major trauma when jumping from aircraft: randomized controlled trial" (2018) <https://www.bmj.com/content/363/bmj.k5094 https://www.bmj.com/content/363/bmj.k5094>