THE PREVALENCE OF VITAMIN D DEFICIENCY IN THE NORTHWESTERN REGION OF THE RUSSIAN FEDERATION AMONG THE RESIDENTS OF ST. PETERSBURG AND PETROZAVODSK by T L Karonova, E N Grinyova, I L NikitiM, E V Tsvetkova, A M Todieva, O D Belyaeva, E P Mikheeva, P Yu Globa, A T Andreeva, I S Beletskaya, N V Omelchuk, L S Fulonova, E V Shlyakhto

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