    Sentence 1: Researchers at Sweden 's  Karolinska Institute reanalyzed data from  more than 2,000 infants who had been         treated with radiation for a benign  birthmark condition between 1930 and  1959.    Sentence 2: Researchers at Sweden 's  Karolinska Institute recently went over data  from more than 2,000 children treated with  radiation for a harmless birthmark  condition between 1930 and 1959 .