For citations:

Dolgopolov I.S., Rykov M.Yu., Ryabtsev A.A., Koltsova S.Yu. Congenital methemoglobinemia and abnormal hemoglobin M variant in a newborn with cyanosis. Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics). 2023;68(2):81-85. (In Russ.) https://doi.org/10.21508/1027-4065-2023-68-2-81-85