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I cam remember a lot of debate and evidence going back to 1G and 2G. The thing about 4G, is there just hasn't been enough proper study so even though it has been around for a while, we still don't fully understand it.

Studies have been going on by the WHO for a very long time and that is why the network and mobile phones generally is classifies as a possible cause as it is not yet proven. So being possible cause means it might have not been proven but it doesn't mean it doesn't causes it or it does causes it.

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