title: Westermark's and Palla's signs in acute and chronic pulmonary embolism: Still valid in the current computed tomography era.
authors.affiliation: Department of Medicine, Division of Cardiovascular Diseases, 200 First St SW Rochester MN, 55905, United States. E-mail: brenessalazar.jorge@mayo.edu.
authors.forename: Jorge A
authors.initials: JA
authors.lastname: Brenes-Salazar