Aplastic anemia and paroxysmal nocturnal hemoglobinuria in children and adults in two centers of Northern Greece oleh Eleni Gavriilaki, Athanasios Tragiannidis, Maria Papathanasiou, Sotiria Besikli, Paraskevi Karvouni, Vassiliki Douka, Eleni Paphianou, Emmanuel Hatzipantelis, Giorgos Papaioannou, Anastasia Athanasiadou, Anastasia Marvaki, Alkistis-Kira Panteliadou, Anna Vardi, Ioannis Batsis, Antonia Syrigou, Despina Mallouri, Chrysavgi Lalayanni, Ioanna Sakellari