Report copyright - static.cambridge.orgcambridge... · Web viewNASC-NRC Twin Cohort2 9 years or less exact years 8 10 0 0 0 0 10 years 10 5 5 0 0 0 0 11 years 11 4 4 0 0 0 0 12 years 12 30 29 0 0 0
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