How the 'plates' of a health system can shift, change and adjust during economic recessions: A qualitative interview study of public and private health providers in Brazil's São Paulo and Maranhão states. - Russo G; Levi ML; Seabra Soares de Britto E Alves MT; Carneiro Alves de Oliveira BL; de Souza Britto Ferreira de Carvalho RH; Andrietta LS; Filippon JG; Scheffer MC (PloS one, 2020)