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 VO 8 IS 4 A1 Mathangasinghe, Yasith A1 Pradeep, Saman A1 Perera, Udeshika A1 Punchihewa, Ramani YR 2022 UL http://openres.ersjournals.com/content/8/4/00256-2022.abstract AB