Yeni, H., F. Yani, A. Izzah, and G. Lubis. “Relationship Between Serum Ferritin and Zinc Levels in Patients With Major Thalassemia”. Paediatrica Indonesiana, Vol. 59, no. 3, June 2019, pp. 144-9, doi:10.14238/pi59.3.2019.144-9.