The BMJ Christmas edition is a bit of humour. It's making fun of how everything needs to be a randomized controlled trial and observational evidence is consider

The BMJ Christmas edition is a bit of humour. It's making fun of how everything needs to be a randomized controlled trial and observational evidence is considered inferior ignoring all common sense. I would have linked the older version of this joke study: https://www.bmj.com/content/327/7429/1459 https://www.bmj.com/content/327/7429/1459