BACKGROUND: The Coronavirus disease-19 (COVID-19) primarily affects respiratory system leading to acute hypoxemic respiratory failure. Invasive mechanical ventilation has been a gold standard in the respiratory therapy of patients with acute respiratory distress syndrome (ARDS). It requires advanced ventilators. qualified intensivists and trained intensive care unit (ICU) staff to man... https://macorners.shop/product-category/birthstone-necklace/