Pervasive developmental disorders are a group of neurodevelopmental disorders characterized by impairments in communication. reciprocal social interaction and restricted repetitive behaviors or interests. The term autism spectrum disorders (ASD) has been used to describe their variable presentation. Although the cause of these disorders is not yet known. https://thebookmarkid.com/story19599539/strategi-aktif-pasif-dalam-optimalisasi-portofolio-saham-indeks-lq-45