Environmental and Socio-demographic Determinants of the Age at Menarche among Secondary School Girls in the Niger-Delta Region of Nigeria. African Journal of Tropical Medicine and Biomedical Research, Delta, Nigeria, v. 1, n. 3, p. 43–49, 2020. Disponível em: https://www.ajtmbr.org.ng/index.php/home/article/view/16. Acesso em: 3 feb. 2026.