Mirza Muhammad Ayub Baig, Muhammad Adnan, Zohaib Ramzan, Muhammad Usman Baig, Faaiz Sultan (2022) “Respiratory outcomes after 12 weeks in patients recovered from COVID-19 managed with non-invasive positive pressure ventilation”, Pakistan Journal of Medical & Health Sciences, 16(04), p. 12. doi: 10.53350/pjmhs2216412.