title: Updating clinical endpoints in pulmonary arterial hypertension: when challenges are welcome.
authors.affiliation: Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
authors.forename: Paul M
authors.initials: PM
authors.lastname: Hassoun
authors.forename: Sylvia
authors.initials: S
authors.lastname: Nikkho
authors.forename: Ronald J
authors.initials: RJ
authors.lastname: Oudiz