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The effect mobile phone radiation has on human health is the subject of recent interest and study, as a result of the enormous increase in mobile phone usage throughout the world (as of June 2009, there were more than 4.3 billion users worldwide). Mobile phones use electromagnetic radiation in the microwave range, and researchers believe this may be harmful to human health. A large body of research exists, both epidemiological and experimental, in non-human animals and in humans. Other digital wireless systems, such as data communication networks produce similar radiation.
The World Health Organization, based upon the consensus view of the scientific and medical communities, has stated in the past that cancer is likely to be caused by cellular phones or their base stations and that reviews have found convincing evidence for other health effects. The WHO expects to make recommendations about mobile phones in 2010. National radiation advisory authorities have recommended measures to minimize exposure to their citizens.