Chloroquine and hydroxychloroquine: Are they effective against COVID-19?

Chloroquine and hydroxychloroquine: Are they effective against COVID-19?   Based on: published evidence of VERY LOW CERTAINTY and press reports of unpublished evidence. So INTERPRET WITH CAUTION.   The history of medicine is plagued with treatments that promise to be effective but at the end of the day they are not. It is not easy…