The differential impact of economic recessions on health systems in middle-income settings: a comparative case study of unequal states in Brazil - Andrietta, Lucas Salvador; Levi, Maria Luiza; Scheffer, Mario Cesar; Alves, Maria Teresa Seabra Soares de Britto e; Oliveira, Bruno Luciano Carneiro Alves de; Russo, Giuliano (Bmj global health, 2020)