DNA Salivary Methylation Levels of the ACE2 Promoter Are Not Related to ACE2 (rs2285666 and rs2074192), TMPRSS2 (rs12329760 and rs2070788) and ACE1 rs1799752 Polymorphisms in COVID-19 Survivors with Post-COVID-19 Condition. This evidence concerns the gene ACE2 and COVID-19.