Lestari S, Sari DK, Fujiati I, Martina SJ, Nasution NH. Haemoglobin Levels of Adolescent Girls Aged 11-19 Years in North Sumatera are Correlated with Socio-Economic Status and Menstrual Cycle Duration. Pak. J. Nutr. [Internet]. 2020 Feb. 15 [cited 2025 Sep. 6];19(3):122–126. Available from: https://pjnonline.org/pjn/article/view/2839