S.I. MALYAVSKAYA, A.V. LEBEDEV Northern State Medical University, 51 Troitsky Avenue, Arkhangelsk, Russian Federation, 163000  Malyavskaya S.I. — D. Med. Sc., Professor, Head of the Department of Pediatrics, tel. (8182) 21-12-52, e-mail: Malyavskaya@yandex.ru  Lebedev A.V. — Cand. Med. Sc., Associate Professor of the Department of Pathological Physiology, tel. (8182) 21-12-52, e-mail: andruleb@yandex.ru   Cross-sectional investigation of […]