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Ryzhakov SA, Podluzhnaia MIa, Zaĭtseva NV.Ryzhakov SA, et al. Among authors: zaitseva nv.Probl Sotsialnoi Gig Zdravookhranenniiai Istor Med. 2009 May-Jun;(3):5-8.Probl Sotsialnoi Gig Zdravookhranenniiai Istor Med. 2009.PMID: 19708590Russian.