ACE2 and chronic obstructive pulmonary disease: Patients with chronic respiratory conditions, particularly chronic obstructive pulmonary disease (COPD), are at the forefront of the risk group for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection due to diminished pulmonary reserve and increased expression of the angiotensin-converting enzyme 2 (ACE-2) receptor within the small airways [3].