ACE2 and Middle East respiratory syndrome: HSPA5: heat shock protein family A (Hsp70) member 5; BiP: binding immunoglobulin protein; GRP78: glucose regulating protein 78; SARS-CoV-2: severe acute respiratory syndrome coronavirus 2; COVID-19: coronavirus disease 2019; SARS: severe acute respiratory syndrome; MERS: middle east respiratory syndrome; ARDS: acute respiratory distress syndrome; ACE2: angiotensin-converting enzyme 2; IHC: immunohistochemistry; HPA: Human Protein Atlas; GEPIA: The Gene Expression Profiling Interactive Analysis; GTEx: Genotype Tissue Expression; OS: overall survival.