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The antigen test some of the participants had checks the blood levels of a cancer-associated protein.
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One group of volunteers was subjected to manual examination while the other had an antigen test.
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The institute that conducted the research cannot be considered traditional since it is relatively new.
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There are schools which award students iPads if they never miss a day during a school year.
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The novelty of fining students who play truant is shocking to most people in the USA.