Impact of the COVID-19 pandemic on the mental health of frontline healthcare workers in a highly affected region in Brazil. - Cohen M; Cruz LN; Cardoso RB; Albuquerque MFPM; Montarroyos UR; de Souza WV; Ludermir AB; de Carvalho MR; da Silva Vicente JD; Viegas Filho MP; Cortes FJM; de Siqueira Silva MT; et al. (BMC psychiatry, 2023)