Studies showing no radiofrequency radiation effects on rats missing important factors

I have been reading some of the studies at PubMed, such as this one, which find no effect of radiofrequency exposure on lab animals, including memory function or sleep patterns, etc.

However, none of the animals in these studies were made to have higher levels of heavy metals/mercury, metallic implants, diabetes or other factors that could interact with rf to cause or amplify effects.

Overall health status, genetics and age (very young/very old) are all factors not accounted for. And the length and cumulative doses of exposure would not necessarily mirror the chonic dosing people are getting today. Therefore, to say studies of healthy rats prove rf radiation is harmless to humans as they are exposed today is illogical (and irresponsible).