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Is there a published study for minimum effective distancing when cloth facemasks are used by everyone?

Question asked by Thomas Crute on Jun 22, 2020

Many universities are employing protective measures of 6-foot distancing with only a recommendation of a face-covering.  How much can the distance be safely decreased when everyone is wearing a cloth face covering to mitigate dispersal of respiratory droplets?  Is anyone aware of a rigorous study with data on this subject?