Rahman, Aulia, Sri Melati Munir, Indra Yovi, and Andreas Makmur. 2021. “The Relationship of Chest X-Ray in COVID-19 Patients and Disease Severity in Arifin Achmad General Hospital Riau”. Jurnal Respirasi 7 (3):114-21. https://doi.org/10.20473/jr.v7-I.3.2021.114-121.