Napitupulu, Erlina, Fera Wahyuni, Tina Tobing, Muhammad Ali, and Bidasari Lubis. “Correlation Between Hemoglobin Level and Left Ventricular Systolic Functions and Dimensions in Children With Chronic Severe Anemia”. Paediatrica Indonesiana 51, no. 2 (April 30, 2011): 79-83. Accessed April 29, 2024. https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/891.