Causes of multidrug-resistant tuberculosis from the perspectives of health providers: challenges and strategies for adherence to treatment during the COVID-19 pandemic in Brazil - Souza, Ludmilla Leidianne Limirio; Santos, Felipe Lima dos; Crispim, Juliane de Almeida; Fiorati, Regina Celia; Dias, Sónia; Bruce, Alexandre Tadashi Inomata; Alves, Yan Mathias; Ramos, Antônio Carlos Vieira; Berra, Thais Zamboni; Costa, Fernanda Bruzadelli Paulino da; Alves, Luana Seles; Monroe, Aline Aparecida; et al. (BMC Health Services Research, 2021)