    Sentence t Researchers at Sweden 's Karolinska institute  reanalyzed data from more than 2000 infants who hadbeen  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 2000 chidren  treated with radiation for a harmless birthmark condition  between 1930 and 1959.