Diagnostics and treatment of chronic constipation in adults: clinical guidelines of the Russian gastroenterological association by V. T. Ivashkin, I. V. Mayev, A. A. Sheptulin, A. S. Trukhmanov, Ye. A. Poluektova, Ye. K. Baranskaya, O. S. Shifrin, T. L. Lapina, M. F. Osipenko, V. I. Simanenkov, I. B. Khlynov

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