| Generic
intro |
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| • | X is
common in many countries with a high |
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| prevalence
of Y (1-15). |
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| • | Prior
research suggested that X causes Y (16-30). |
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| • | More
recent studies have suggested that Y causes |
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| X (31-45). |
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| • | Only
a few studies have considered the association |
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| of X
and Z (46-50) or Y and Z (51-53). |
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| • | We
conducted a study to test the hypothesis that Z |
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| is
associated with both X and Y. |
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