Shamsa Kanwal, Muhammad Aamir, Sobia Irum, Zujaja Haroon, Muhammad Usman Munir, Afshan Bibi. A case of congenital methaemoglobinaemia with secondary polycythemia. J Pak Med Assoc [Internet]. 2022 Jan. 29 [cited 2026 May 26];72(6):1218-21. Available from: https://jpma.org.pk/index.php/public_html/article/view/2129