If the number hits a different marker, it could generate a different trading strategy.

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Compared with other smart cards in China, Hainan's marker has a number of advantages.

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"All these studies tell us is it is much more complicated than just trying to fix that number because that is a surrogate marker, or a predictor for the disease, not the disease itself, " says Robert Centor, a professor of internal medicine at the University of Alabama, Birmingham.

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