sentence1: 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 .
sentence2: 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 .