There was an increasing trend of risk between 0 and 4 months, a plateau from 4 to 9 months, and increasing risk again at introductions from 9 months on ( Supplementary Fig. 1 ).
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There was an increasing trend of risk between 0 and 4 months, a plateau from 4 to 9 months, and increasing risk again at introductions from 9 months on ( Supplementary Fig. 1 ).