Effects of Teachers' Verbal and Non-verbal Scaffolding on Everyday Classroom Performances of Students with Down Syndrome Effets du Soutien Verbal et Non Verbal des Enseignants sur les Performances Quotidiennes en Classe des E´le ¤ ves Trisomiques Efectos de 'Scaffolding' Verbal y No Verbal de los Profesores en las Actuaciones Cotidianas en las Clases de Estudiantes con el S´ L ndrome de Down

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