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The research design was a nonequivalent group comparison with pretest and post-test.
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Study design: We conducted a retrospective cohort study with a nonequivalent control group.
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Design and methods: The research design was a nonequivalent group comparison (n = 163) with pretest and post-test.
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The transfer of equivalent titers of vaccine-elicited NAb into AG129 mice also revealed nonequivalent protection, indicating qualitative differences among antibodies (Abs) elicited by these vaccines.