For citations:
Lamkova IA, Parfenov VA. Insomnia in chronic non-specific low back pain. Nevrologiya, neiropsikhiatriya, psikhosomatika = Neurology, Neuropsychiatry, Psychosomatics. 2021;13(5):62-67. (In Russ.) https://doi.org/10.14412/2074-2711-2021-5-62-67