FIGURE 2.

Changes in Activity Index and Category Normalized Citation Impact for the periods 2003–2008, 2009–2014 and 2015–2020 for the 6 countries in the research of stroke and neurovascular unit. (A) Romania has emerged as new‐star country. (B) Switzerland increased in CNCI, but decreased in AI. (C, D) Canada and Sweden had a sharp decline in influence in CNCI. (E) USA had steady improvement in CNCI but decreased in AI. (F) China shown great increase in AI which indicates research effort and the number of articles from China increased sharply from 2003–2008 to 2015–2020. If AI or CNCI was greater than 1, then the research power or the academic influence of a country was higher than the global average, and vice versa. The size of the bubbles represented the number of articles one country published in the time period