The Principles of Brazil's Unified Health System (SUS) and Current Challenges to Ensuring Universal Access to Healthcare - Helenitta Melo da Silva Alves; Juliana Reis de Alcantara; Simonia Mara de Oliveira; Karen de Fátima Figueroa Bohórquez; Alanir Aparecida da Silva; Juliana Aparecida Pereira Ribeiro; Rene Humberto Rodrigues; Suzana Santos da Costa (RSV, 2026)