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  • Yu Xie,

    1. University of Michigan
      Quantitative Methodology Program, Survey Research Center
      Institute for Social Research
      426 Thompson Street
      Ann Arbor, Michigan 48106-1248, U.S.A.
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  • Susan Murphy

    1. University of Michigan
      Quantitative Methodology Program, Survey Research Center
      Institute for Social Research
      426 Thompson Street
      Ann Arbor, Michigan 48106-1248, U.S.A.
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