RT Journal Article SR Electronic T1 Treatment outcomes among childhood extensively drug-resistant tuberculosis patients in Pakistan JF ERJ Open Research JO erjor FD European Respiratory Society SP 00551-2021 DO 10.1183/23120541.00551-2021 A1 Muhammad Abubakar A1 Nafees Ahmad A1 Muhammad Atif A1 Amer Hayat Khan A1 Abdul Ghafoor YR 2021 UL http://openres.ersjournals.com/content/early/2021/11/11/23120541.00551-2021.abstract AB