title: [On the occasion of A. N. Sysin's 125th birthday].
authors: K G
authors: KG
authors: Vasil'ev
authors: Iu N
authors: IuN
authors: Vasil'ev
mesh_terms: D004813:Epidemiology / Q000266:history*; D006296:Health Services / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D012426:Russia