Catalan Children’s Communication Checklist (CCC-2) Developmental Language Disorder (DLD) ERP European Portuguese GLUT 1 transporter deficiency syndrome (GLUT1DS) MacArthur-Bates CDI Mandarin Chinese Spanish acoustics adolescent alternating treatments assessment atypical language acquisition autism bic Book Industry Communication::J Society & social sciences::JM Psychology bilingual bilingualism birth order birth weight children clitics cognitive development comprehension consonant deaf derivational errors developmental disorders developmental language disorder developmental language disorder (DLD)