Before revision:  I show here these dramatic variations in fatality rates across age and gender are impressively strongly correlated (r^2=0.91 with only one free parameter) with levels of the ACE2 protein in rat lungs, which are in turn qualitatively similar to expression in humans .
After revision:  I show here these dramatic variations in fatality rates across age and gender are quantitatively explained by the levels of the ACE2 protein in rat lungs, which are in turn qualitatively similar to expression in humans .