Developmental dyslexia; Reading disability; Leseschwäche; Rechtschreibschwäche; Lese-Rechtschreibschwäche; LRS; Legasthenie; Dyslexia ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Pathologischer Spracherwerb (phon.) ; Phonological development (pathol.) ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; ADHD; Hyperactivity disorder; Attention deficit hyperactivity disorder