For citations:
Shikh EV, Sizova ZM, Astaeva MO. Oral administration of cyanocobalamin for functional vitamin В12 deficiency: efficacy and safety. Nevrologiya, neiropsikhiatriya, psikhosomatika = Neurology, Neuropsychiatry, Psychosomatics. 2021;13(4):109-115. (In Russ.) https://doi.org/10.14412/20742711-2021-4-109-115