Report copyright - NOHC present2012...WBV Frequency Period 1 Period 2 Period 3 Age at First WBV Rate of the first WBV 0.97 2.96 1.25 6.07 0.93, 1.02 1.41, 6.15 1.14, 1.36 0.79, 46.65 0.203 0.004
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