For citations:
Zalyalova ZA, Ekusheva EV. Vitamin B12 deficiency and Parkinson’s disease. Nevrologiya, neiropsikhiatriya, psikhosomatika = Neurology, Neuropsychiatry, Psychosomatics. 2023;15(3):121-127. (In Russ.) https://doi.org/10.14412/2074-2711-2023-3-121-127