RT Journal Article SR Electronic T1 Pathological characteristics of mediastinal masses in Sri Lanka 2017–2021: A retrospective observational study JF ERJ Open Research JO erjor FD European Respiratory Society SP 00256-2022 DO 10.1183/23120541.00256-2022 A1 Y Mathangasinghe A1 IHDS Pradeep A1 SAU Perera A1 R Punchihewa YR 2022 UL http://openres.ersjournals.com/content/early/2022/07/28/23120541.00256-2022.abstract AB