Co-Morbidity of Infectious and Addictive Diseases in St. Petersburg and the Leningrad Region, Russia by Krupitsky, E.M., Zvartau, E.E., Lioznov, D.A., Tsoy, M.V., Egorov, V.Y., Belyaev, T.V., Antonov, T.V., Brazhenko, N.A., Zagdyn, Z.M., Verbitskaya, E.V., Zorina, Y., Karandashova, G.F., Slavina, T.Y., Grinenko, A.Y., Samet, J.H., Woody, G.E.

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