Parachute use to prevent death and major trauma related to gravitational challenge: systematic review of randomised controlled trials — Smith and Pell 327 (7429): 1459 — bmj.com

As with many interventions intended to prevent ill health, the effectiveness of parachutes has not been subjected to rigorous
evaluation by using randomised controlled trials. Advocates of evidence based medicine have criticised the adoption of interventions
evaluated by using only observational data. We think that everyone might benefit if the most radical protagonists of evidence
based medicine organised and participated in a double blind, randomised, placebo controlled, crossover trial of the parachute.

Hmm.. hur ska jag få till en referens till denna artikel 🙂