Interoperability in universal healthcare systems: insights from Brazil's experience integrating primary and hospital health care data - Fernandez, Michelle; Pinto, Heider Aurélio; Fernandes, Luisa M. M.; Oliveira, João André Santos de; Lima, Ana Maria Freire de Souza; Santana, José Santos Souza; Chioro, Arthur (Frontiers in Digital Health, 2025)