Use of computerized tomography and chest X-rays in evaluating efficacy of aerosolized recombinant human DNase in cystic fibrosis patients younger than age 5 years: A preliminary study * Presented in part at the International Conference for the American Thoracic Society, April 23–28, 1999, and at the North American Annual Cystic Fibrosis Conference, October 7–10, 1999.