Molecular investigation of Angelman syndrome in Greece. Screening for UBE3A mutations: preliminary results - Goulielmos George; Frysira Helen; Kitsiou Sofia; Vogiatzakis Nikolaos; Sofocleous Christalena; Tzagaraki Evmorfia; Kanavakis Emmanouil; Mavrou Ariadni (Annals of General Psychiatry, 2008)