Lestari, Sri, Dina Keumala Sari, IstiIlmiati Fujiati, Sake Juli Martina, and Nur Hidayah Nasution. 2020. “Haemoglobin Levels of Adolescent Girls Aged 11-19 Years in North Sumatera Are Correlated With Socio-Economic Status and Menstrual Cycle Duration”. Pakistan Journal of Nutrition 19 (3): 122–126. https://doi.org/10.3923/pjn.2020.122.126.