Prevalence of childhood anaemia in Brazil: still a serious health problem: a systematic review and meta-analysis - Almeida, Carlos Alberto Nogueira de; Ued, Fábio da Veiga; Del Ciampo, Luiz Antonio; Martinez, Edson Zangiacomi; Ferraz, Ivan Savioli; Contini, Andrea Aparecida; Cruz, Franciele Carolina Soares da; Silva, Raquel Farias Barreto; Nogueira-de-Almeida, Maria Eduarda; Lamounier, Joel Alves (Public Health Nutrition, 2021)