Fig. 1From: Chest x-ray severity score in COVID-19 patients on emergency department admission: a two-centre studyCXR subdivision, with three parts for each lung: superior zone (from the lung apex to the aortic arch profile), middle zone (lung hilum, from the aortic arch profile to the inferior margin of the left pulmonary hilum), and inferior zone (from the inferior margin of the left pulmonary hilum to the diaphragm)Back to article page