COVID‐19(8) Result(8) SARS‐CoV‐2(7) COVID‐19(7) ACE2(7) SARS‐CoV‐2(7) variant(6) death(5) Infection(5) enzyme(5) reported(5) Analysis(5) virus(5) receptor(5) susceptibility(5) polymorphism(5) Protein(5) Characteristics(5) Epidemic(4) performed(4) cellular(4) Population(4) outbreak(4) caused(4) Pneumonia(4) Chinese(4) eight(3) mechanism(3) mutant(3) angiotensin(3)