I was doing some reading on this the other day and there aren't any credible sources for good reason. Wish I could find the article that stated this as it was a Mayo Clinic doctor I believe that stated something along these lines.

That speculating on the risk or safety of a technology that hasn't been fully implemented or tested in any meaningful controlled way is impossible. It will be years if not decades before the potential health risks are known if any and by that time a whole new technology will have replaced 5G.

That answer really sounded like a politician running for office not giving a real answer at first, but after giving it a little thought I decided to stop digging into it because he was correct.