Cross sectional study of serum selenium concentration and esophageal squamous dysplasia in western Kenya by Natalie R. Pritchett, Stephen L. Burgert, Gwen A. Murphy, John D. Brockman, Russell E. White, Justus Lando, Robert Chepkwony, Mark D. Topazian, Christian C. Abnet, Sanford M. Dawsey, Michael M. Mwachiro

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