E.K. VALEYEV, S.V. OGURTSOV, I.E. VALEYEV, T.A. BIKMULLIN Republic Clinical Hospital of the MH of RT, 138 Orenburskiy Trakt, Kazan, Russian Federation, 420064 Valeyev E.K. — D. Med. Sc., Associate Professor, Chief Researcher, tel. +7-987-296-88-52, e-mail: ekv44@mail.ru Ogurtsov S.V. — neurosurgeon, tel. +7-917-853-95-86, e-mail: sergogurtsov@rambler.ru Valeyev I.E. — Cand. Med. Sc., neurosurgeon, tel. +7-987-296-88-51, e-mail: […]