The HCQ thing started, as far as I know, with Raoult, who advocated HCQ and azithromycin (but not zinc) (well, it was _used_ before that; some hospitals were throwing all sorts of things at the wall in the early days. But he seems to have been the first to claim evidence). The zinc thing seemed to emerge after initial attempts to reproduce his protocol didn't work. Who are these experts advocating zinc?