REFERENCES
1. Starchina Yu.A. B vitamins in the treatment of diseases of the nervous system. Nevrologiya, neyropsikhiatriya, psikhosomatika [Neurology, Neuropsychiatry, Psychosomatic®]. 2009; (2): 84-7. (in Russian)
2. Akhmedzhanova L.T., Solokha O.A., Strokov I.A. B vitamins in the treatment of neurological diseases. RMZh [Russian Medical Journal]. 2009; 17 (11): 776-83. (in Russian)
3. Markle H.V. Cobalamin. Crit Rev Clin Lab Sci. 1996; 33: 247-356.
4. Krasnovsky A.L., Grigor’ev S.P., Alekhina R.M., et al. Modern possibilities of diagnosis and treatment of vitamin B 12 deficiency. Klinitsist [Clinician]. 2016; 10 (3): 15-25. DOI: https://doi.org/10.17650/1818-8338-2016-10-3-15-25 (in Russian)
5. Damiao Ch.P., Rodrigues A.O., Pinheiro M., et al. Prevalence of vitamin B 12 deficiency in type 2 diabetic patients using metformin: a crosssectional study. Sao Paulo Med J. 2016; 134 (6): 473-9. DOI: https://doi.org/10.1590/1516-3180.2015.01382111
6. Ametov A.S., Kosyan A.A. The role of homocysteine in the development of diabetic polyneuropathy and endothelial dysfunction. En-dokrinologiya: novosti, mneniya, obuchenie [Endocrinology: News, Opinions, Training]. 2019; 8 (1): 32-9. DOI: https://doi.org/10.24411/2304-9529-2019-11004 (in Russian)
7. Spirichev V.B Vitamins, vitamin-like and mineral substances. Directory. Moscow: MTsFER, 2004: 240 p. (in Russian)
8. Nardin R.A., Amic A.N., Raynor E.M. Vitamin B (12) and methylmalonic acid levels in patients presenting with polyneuropathy. Muscle Nerve. 2007; 36 (4): 532-5.
9. Ametov A.S., Kosyan A.A., Pashkova E. Yu., Garieva M.A. Diagnosis and clinical significance of subclinical vitamin B 12 deficiency in patients with diabetic neuropathy. Trudniy patsient [Difficult Patient]. 2020; 11-12 (18): 27-31. DOI: https://doi.org/10.24411/2074-1995-2020-10079 (in Russian)
10. Poddar R., Paul S. Novel crosstalk between ERK MAPK and p38 MAPK leads to homocysteine-NMDA receptor mediated neuronal cell death. J Neurochem. 2013; 124 (4): 558-70.
11. Veber D., Mutti E. Increased levels of the CD 40:CD 40 ligand dyad in the cerebrospinal fluid of rats with vitamin B 12 (cobalamin)-deficient central neuropathy. J Neuroimmunol. 2006; 176 (1-2): 24-33.
12. Mrozikiewicz-Rakowska B., Chylinska A., Sienko D. Vitamin B 12 in diabetes - a new treatment paradigm? Clin Diabetol. 2020; 9 (6): 489-96. DOI: https://doi.org/10.5603/DK.2020.0060
13. Buvat D.R. Use of metformin is a cause of vitamin B 12 deficiency. Am Fam Physician. 2004; 69: 264.
14. Aroda V.R., Edelstein S.L., Goldberg R.B., et al. Long-term metformin use and vitamin b12 deficiency in the diabetes prevention program outcomes study. J Clin Endocrinol Metab. 2016; 101: 1754-61. DOI: https://doi.org/10.1210/jc.2015-3754
15. American Diabetes Association. Pharmacologic approaches to gly-cemic treatment: Standards of Medical Care in Diabetes - 2021. Diabetes Care. 2021; 44 (Suppl 1): 111-24. DOI: https://doi.org/10.2337/dc21-S009
16. IDF Diabetes Atlas [Electronic resource]. URL: http://www.diabetes-atlas.org/ (date of access February 22, 2020)
17. Kaiser A.B., Zhang N., Pluijm W.V.D. Global prevalence of type 2 diabetes over the next ten years (2018-2028). Diabetes. 2018; 67 (Suppl 1).
18. Zalaket J., Wehbe T., Jaoude E. Vitamin B 12 deficiency in diabetic subjects taking metformin: a cross sectional study in a Lebanese cohort. J Nutr Intermediary Metab. 2018; 11: 9-13.
19. Biryukova E.V., Gannenkova E.S., Solov’eva I.V. Diabetic polyneuropathy: what have we achieved in understanding the problem? RMZh [Russian Medical Journal]. 2020; (1): 14-9. (in Russian)
20. Niafar M., Hai F., Porhomayon J., Nader N.D. The role of metformin on vitamin B 12 deficiency: a meta-analysis review. Intern Emerg Med. 2015; 10 (1): 93-102. DOI: https://doi.org/10.1007/s11739-014-1157-5
21. Yang W., Cai X., Wu H., Ji L. Associations between metformin use and vitamin B 12 levels, anemia, and neuropathy in patients with diabetes: a meta-analysis. J Diabetes. 2019; 11: 729-43. DOI: https://doi.org/10.1111/1753-0407.12900
22. Poddar R., Paul S., et al. Role of AMPA receptors in homocysteine-NMDA receptor-induced crosstalk between ERK and p38 MAPK. J Neurochem. 2017; 142 (4): 560-73. DOI: https://doi.org/10.1111/jnc.14078
23. Wile D.J., Toth C. Association of metformin, elevated homocysteine, and methylmalonic acid levels and clinically worsened diabetic peripheral neuropathy. Diabetes Care. 2010; 33 (1): 156-61.
24. Roy R.P., Ghosh K., Ghosh M., et al. Study of vitamin B 12 deficiency and peripheral neuropathy in metformin-treated early type 2 diabetes mel-litus. Indian J Endocr Metab. 2016; 20: 631-7.
25. Ametov A.S., Kosyan A.A., Pashkova E. Yu. Influence of hyperhomo-cysteinemia on the level of antioxidant enzymes in the blood and on the severity of diabetic neuropathy in patients with type 2 diabetes mellitus // Endokrinologiya: novosti, mneniya, obuchenie [Endocrinology: News, Opinions, Training]. 2019; 8 (2): 9-16. (in Russian)
26. P’yanykh O.P., Kosyan A.A., Garieva M.A. Complex therapy of diabetic polyneuropathy taking into account endothelial dysfunction in patients with type 2 diabetes mellitus. Endokrinologiya: novosti, mneniya, obuchenie [Endocrinology: News, Opinions, Training]. 2020; 9 (2): 31-9. DOI: https://doi.org/10.33029/2304-9529-2020-9-2-31-39 (in Russian).
27. Ametov A.S., Kosyan A.A., Garieva M.A. The importance of early diagnosis of subclinical vitamin B 12 deficiency in patients with type 2 diabetes mellitus, complicated by diabetic neuropathy. Process Manag Sci Dev. 2019; 4: 122-8. URL: http://naukarus.ru/wp-content/uploads/2019/11/DOIPMSD-November-14-Part-4.pdf DOI: https://doi.org/10.34660/INF.2019.1.41251
28. Gojka R. WHO Global report on diabetes: a summary. Int J Non-commun Dis. 2016; 1 (1): 3-8. DOI: https://doi.org/10.4103/2468-8827.184853
29. Marathe P.H., Gao H.X., Close K.L. American Diabetes Association Standards of Medical Care in Diabetes 2017. J Diabetes. 2017; 9 (4): 320-4.
30. Devalia V., Hamilton M.S., Molloy A.M., Guidelines for the diagnosis and treatment of cobalamin and folate disorders. Br J Haematol. 2014; 166 (4): 496-513. DOI: https://doi.org/10.1111/bjh.12959
31. England J.D., Gronseth G.S., Franklin G., et al. Practice parameter: evaluation of distal symmetric polyneuropathy: role of laboratory and genetic testing (an evidence-based review). Report of the American Academy of Neurology, American Association of Neuromuscular and Electrodiagnostic Medicine, and American Academy of Physical Medicine and Rehabilitation. Neurology. 2009; 72: 177-84.
32. Adcock B.B., McKnight J.T. Cobalamin pseudodeficiency due to a transcobalamin I deficiency. South Med J. 2002; 95 (9): 1060-2.
33. Vidal-Alaball J., Butler C.C., Cannings-John R., et al. Oral vitamin B 12 versus intramuscular vitamin B 12 for vitamin B 12 deficiency. Cochrane Database Syst Rev. 2005; 3: CD 004655.
34. Castelli M.C., Friedman K., Sherry J., et al. Comparing the efficacy and tolerability of a new daily oral vitamin B 12 formulation and intermittent intramuscular vitamin B 12 in normalizing low cobalamin levels:a randomized, open-label, parallel-group study. Clin Ther. 2011; 33 (3): 358-71.e2.
35. Kuzminski A.M., Del Giacco E.J., Allen R.H., et al. Effective treatment of cobalamin deficiency with oral cobalamin. Blood. 1998; 92 (4): 1191-8.
36. Didangelos T., Karlafti E., Kotzakioulafi E., et al. Vitamin B 12 supplementation in diabetic neuropathy: a 1-year, randomized, double-blind, placebo-controlled trial. Nutrients. 2021; 13 (2): 395. DOI: https://doi.org/10.3390/nu13020395
37. Nyholm E., Turpin P, Swain D., et al. Oral vitamin B 12 can change our practice. Postgrad Med J. 2003; 79 (930): 218-20.
38. Kwong J.C., Carr D., Dhalla I.A., et al. Oral vitamin B 12 therapy in the primary care setting: a qualitative and quantitative study of patient perspectives. BMC Fam Pract. 2005; 6 (1): 8.
39. Kolber M.R., Houle S.K. Oral vitamin B 12: a cost-effective alternative. Can Fam Physician. 2014; 60 (2): 111-2.