ACEI=angiotensin-converting enzyme inhibitor; ARB=angiotensin receptor
blocker; COPD=chronic obstructive pulmonary disease; HR=hazard ratio;
OR=odds ratio1The definition of severe/critical disease in Yang et
al., Meng et al., Feng et al., Peng et al., and Liu et al. was based on
the definition given in Diagnosis and Treatment Protocol for Novel
Coronavirus Pneumonia by Chinese National Health Commission; in Zhang
et. al was defined based on the presence of septic shock, and in Zeng
et. al was based on the guideline for community-acquired pneumonia.2Preprints which are yet to undergo peer-review at the
time of writing.