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