Anemia is associated with severe illness in COVID‐19: A retrospective cohort study

Anemia commonly aggravates the severity of respiratory diseases, whereas thus far, few studies have elucidated the impact of anemia on coronavirus disease 2019 (COVID‐19). The aim of this study was to evaluate the clinical characteristics of patients with anemia, and to further explore the relationship between anemia and the severity of COVID‐19. In this single‐center, retrospective, observational study, a total of 222 confirmed patients...