Respiratory diphtheria in the United States, 1980 through 1995.
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S. Hadler | T. Popović | P. Strebel | M. Wharton | I. Hardy | K. Bisgard | R. Chen | R. Chen | Kristine M. Bisgard | Peter M. Strebel | Melinda Wharton | Robert Chen | Stephen C. Hadler