Table 6 lists the top 10 co-cited references (26, 33–41). The most co-cited reference was “Wound healing and its impairment in the diabetic foot” by Falanga et al. in 200530. All references were clustered into the major 16 clusters, including “#0 diabetic foot ulcer”, “#1 EGF,” “#2 diabetic wound healing,” and “#3 silver nanoparticle,” and so on (Figure 10A). Figure 10B shows that “#11 nanofibers” and “#13 antibacterial properties” continuously evolved. The gene discussed is EGF; the disease is diabetic foot.