Application of the Respondent-Driven Sampling method in an online survey in Brazil: COVID-19 morbidity in the post-pandemic period. - Souza Júnior PRB; Damacena GN; Castilho EA; Almeida WDS; Gomes CS; Malta DC; Szwarcwald CL (Revista brasileira de epidemiologia = Brazilian journal of epidemiology, 2026)