it's an easy conclusion to get to just from the basis of what the human body does : we breath and exchange air -- that's plain for anyone to see , so we try to avoid breathing particles. We know that looking at the sun injures the eye -- we can see the evidence when looking at a patient. We know that fire burns the skin.
The human body has junctions and functionality that actually interact with energy at those levels.
Similarly we know what injuries from intense EM radiation look like, and it's not vague chronic fatigue syndrome-like symptoms, and it isn't caused by bombardment by non-interactive low power levels of differing frequencies and sources.
> Everyone on earth is exposed to radiowaves, so to establish a demographically matched control population to a radio wave laden case population is simply impossible
it's not impossible whatsoever to block all 'radiowaves' ; it's impractical and needless, so the study isn't being conducted by anyone that matters.
p.s. lead is a piss-poor 'radiowave vault' material compared to copper/steel/aluminum.