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A young cancer patient reacts as a doctor studies a radiograph in a hospital for oncological diseases in the Ukrainian city of Donetsk April 25, 2006. Large amounts of radioactive fallout came down on the regions around the Chernobyl nuclear power plant after the explosion of its fourth reactor in 1986, leading to a substantial increase of radiation-inflicted diseases in the population. Ukraine this week marks the 20th anniversary of the world's worst civil nuclear disaster. [Reuters]