For citations:
Lesina O.N., Golovina N.V., Baranova I.P., Kalinkina V.A., Ettinger L.S. The effectiveness of immunization of children against Pneumococcal infection in Penza, Russia. CHILDREN INFECTIONS. 2019;18(1):34-37. (In Russ.) https://doi.org/10.22627/2072-8107-2019-18-1-34-37