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Expressive vocabulary size based on MacArthur–Bates Communicative Development Inventories–Second Edition (CDI) percentiles in 13 children with classic galactosemia (CG) who underwent the Babble Boot Camp (BBC) intervention and one child with CG who did not. Horizontal lines at the seventh and 93rd percentiles = ±1.5 SDs. CTR = untreated control with CG; SLE = speech-language early intervention.
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