Fig. 2From: Bioinformatics analysis of the expression and role of microRNA-221-3p in head and neck squamous cell carcinomaThe flow chart of literature search and selection of relevant studies. Sixteen out of 424 GEO microarray datasets met our inclusion criteria. At the same time, a total of 17 articles were retrieved from the initial search, and one papers (Zhou Cheng. et al) were selected after the full-text review based on the inclusion criteriaBack to article page