Vitamin d status during winter months among children and adolescents with cystic fibrosis living in southern Russia by L. Ya. Klimov, S. V. Dolbnya, E. I. Kondratyeva, A. A. Dyatlova, E. A. Enina, V. A. Kuryaninova, A. N. Kasyanova, E. K. Zhekaite, D. V. Bobryshev, I. V. Markarova, T. M. Vdovina, A. A. Shaforost

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