RETRACTION: State of the art and new frontiers in sleep research: New qualitative and quantitative approaches (Engrami, 2002: 24(2), 62-73). Engrami, [S. l.], v. 44, n. 1, 2022. DOI: 10.5937/engrami44-38803. Disponível em: https://test.aseestant.ceon.rs/index.php/engrami/article/view/38803. Acesso em: 11 jun. 2026.