Ayvazyan, Gohar, Nune Baghdasaryan, Lilit Avetisyan, Nane Mnatsakanyan, and Lilit Aleksanyan. 2023. “Serum Vitamin D Concentration in Children With Pneumonia and Acute Respiratory Infections, Risk Factors for Its Low Level”. The Journal of Infection in Developing Countries 17 (10):1413-19. https://doi.org/10.3855/jidc.17749.