ACE2 and diabetes mellitus: Median serum ACE2 and TMPRSS2 levels at presentation did not significantly differ between patients with or without hypertension (6.24 vs. 5.59 ng/mL and 6.92 vs. 5.52, respectively; p = 0.602 and p = 0.698) or between those with or without diabetes (6.60 vs. 5.27 ng/mL and 6.07 vs. 5.81, respectively; p = 0.446 and p = 0.572).