Genetic screening to determine an etiological diagnosis in patients with mental retardation in a southeast region of Brazil - Lourenço, Charles Marques; Giusti, Elisabete; Viana, Vanessa Veríssimo; Bosse, Egeu; Lavoura, Luciana Benedeti; Viana, Antonia de Souza; Vidal, Daniele Candioto; Abreu, Ludmila Serafim de; Pina Neto, João Monteiro de (International Workshop on Fragile X an X- Linked Mental Retardation, 2009)