The Importance of Microelements in Mastering Lessons by Schoolchildren Studying in Urban and Rural Conditions . American Journal of Pediatric Medicine and Health Sciences (2993-2149), [S. l.], v. 1, n. 8, p. 1–4, 2023. Disponível em: https://www.grnjournal.us/index.php/AJPMHS/article/view/869. Acesso em: 4 feb. 2026.