Augmentative and alternative communication in children with down’s syndrome: a systematic review - Barbosa, Renata Thaís de Almeida; Oliveira, Acary Souza Bulle de; Antão, Jennifer Yohanna Ferreira de Lima; Guarnieri, Regiani; Antunes, Thaiany Pedrozo Campos; Arab, Claudia; Massetti, Thaís; Bezerra, Italla Maria Pinheiro; Monteiro, Carlos Bandeira de Mello; Abreu, Luiz Carlos de (BMC Pediatrics, 2018)