Ketogenic diet in the treatment of drug-resistant epilepsy in children: Assessment of clinical efficacy, health care resource consumption, and direct medical costs - E.G. Lukyanova; A.G. Tolkushin; S.O. Ayvazyan; K.V. Osipova; E.A. Pyrieva; A.I. Krapivkin; V.A. Zhestkov (S.S. Korsakov Journal of Neurology and Psychiatry, 2026)