Bias with respect to socioeconomic status: A closer look at zip code matching in a pneumococcal vaccine effectiveness study by Ruth Link-Gelles, Daniel Westreich, Allison E. Aiello, Nong Shang, David J. Weber, Corinne Holtzman, Karen Scherzinger, Arthur Reingold, William Schaffner, Lee H. Harrison, Jennifer B. Rosen, Susan Petit, Monica Farley, Ann Thomas, Jeffrey Eason, Christine Wigen, Meghan Barnes, Ola Thomas, Shelley Zansky, Bernard Beall, Cynthia G. Whitney, Matthew R. Moore

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