Cavezzi, Attilio, Emidio Troiani, and Salvatore Corrao. “COVID-19: Hemoglobin, Iron, and Hypoxia Beyond Inflammation. A Narrative Review”. Clinics and Practice 10, no. 2 (May 28, 2020). Accessed September 21, 2020. https://clinicsandpractice.org/index.php/cp/article/view/1271.