Fig. 5.

Impact of published hiPSC research. a Overall average Five Year Impact Factors 2010 for hiPSC research papers published from 2008 to 2011. Data for those 6 countries that contributed more than 15 studies to the hiPSC research field in this period are shown individually, data for the remaining 14 nations that contributed to hiPSC research are merged in “other”. b Average annual citation frequencies for hiPSC research papers published from 2008 to 2010. Citation analysis was performed for the years 2009 to 2011 starting in the year following the publication of a paper. c Share of hiPSC research papers within the indicated range of citations per year in the total number of studies from the given countries. Papers were grouped according to their average annual citation frequency from 2009 to 2011