Fig. 2

Citation and publication analysis of 407 VIPs. a Citations each year for 278 core VIPs (blue) and 129 non-core VIPs (gray). b Histogram of total citations for core VIPs (blue) and non-core VIPs (gray). c VIPs published per year, with original publications in light blue (core) and light gray (non-core), and subsequent publications in dark blue (core) and dark gray (non-core)