Belgian-Dutch Study: Why in times of COVID-19 you should not walk/run/bike close to each other.

Apparently the safe distance for cyclists is 20 meters.

https://medium.com/@jurgenthoelen/belgian-dutch-study-why-in-times-of-covid-19-you-can-not-walk-run-bike-close-to-each-other-a5df19c77d08