RT Journal Article SR Electronic T1 COL18A1 genotypic associations with endostatin levels and clinical features in pulmonary arterial hypertension: a quantitative trait association study JF ERJ Open Research JO erjor FD European Respiratory Society SP 00725-2021 DO 10.1183/23120541.00725-2021 A1 Catherine E. Simpson A1 Megan Griffiths A1 Jun Yang A1 Melanie K. Nies A1 R. Dhananjay Vaidya A1 Stephanie Brandal A1 Lisa J. Martin A1 Michael W. Pauciulo A1 Katie A. Lutz A1 Anna W. Coleman A1 Eric D. Austin A1 D. Dunbar Ivy A1 William C. Nichols A1 Allen D. Everett A1 Paul M. Hassoun A1 Rachel L. Damico YR 2022 UL http://openres.ersjournals.com/content/early/2022/05/05/23120541.00725-2021.abstract AB