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The International Agency for Research on Cancer (IARC) is a section of the World Health Organization whose mission is to develop strategies for cancer prevention and control. In June 2009, the agency convened a working group of 20 scientists to reassess the carcinogenicity of various sources of radiation. In the past, the IARC has found sufficient proof that solar radiation is a human carcinogen involved in the development of basal cell carcinomas, squamous cell carcinomas, and melanoma. The current working group now finds unquestionable evidence that UV-emitting tanning devices cause melanoma of the skin and of the choroid and ciliary body of the eye. This determination is based on a comprehensive meta-analysis finding that risk for cutane…