Wanted – science driven guidelines for deciding if and how to keep open / reopen schools re: #COVID19

I am compiling some materials on science driven guidelines for how to decide if and how to keep open and/or reopen schools in the face of COVID19. Here are some I have compiled that I seem to be useful.  I would love other examples. (Updated 12/21 at 3 PM) National Academy of Sciences Reopening K-12 …