Mapping cross-border collaboration and communication in cardiovascular research from 1992 to 2012

Figures

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  Figure 1. Growth of publication output by country. Number (left) and share (right) of publications presented for countries that experienced greater than 1% change in share of publications between 1992–1998 and 2006–2012. (Data sourced from Thomson Reuters Web of Science Core Collection.)

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  Figure 2. Citation impact evolution. Average citations normalised by the field and journal impact, by country over time. Countries above the horizontal line (y = 1) have higher observed impact than all cardiovascular publications in that time period. Countries to the right of the vertical line (x = 1) are publishing in journals that have a higher impact than all cardiovascular publications in that time period. Countries presented are those that experienced a greater than average increase in Mean Observed Citation Rate (MOCR change > 3) and an increase to an Normalised Mean Citation Rate or Mean Expected Citation Rate/FECR above 1, between 1992–1998 and 2006–2012. (Data sourced from Thomson Reuters Web of Science Core Collection.)

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  Figure 3. Publications with high impact. Publications cited above average by citation class, time period and country. The combined total of the bars represent the share of publications, for each country, that are cited above average compared with all cardiovascular publications in that time period. The total share of all cardiovascular publications (world standard) that are cited above average for all countries combined is indicated by the red bar. (Data sourced from Thomson Reuters Web of Science Core Collection.)

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  Figure 4. Internationally collaborative publications. Countries with an increase in share of international publications over time are coloured in grey. Countries with a decrease or steady share are in red. (Data sourced from Thomson Reuters Web of Science Core Collection.)

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  Figure 5. Strength of collaborations between countries. The increased width and colour of the line represent stronger collaboration (see Methods). Only strong collaborations are presented, i.e. where the strength of collaboration was at least 0.05 in one time period between country pairs. (Data sourced from Thomson Reuters Web of Science Core Collection.)

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  Figure 6. Citation and reference domesticity. Citation domesticity (left) represents the share of citations to the cardiovascular dataset coming from the same country as the country of the cited publications in the dataset; reference domesticity (right) represents the share of references in the publications of the cardiovascular dataset that have authors from the same country. The country codes highlighted in red indicate an increase in domesticity between 1992–1998 and 2006–2012. (Data sourced from Thomson Reuters Web of Science Core Collection.)

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  Figure 7. Flow of citations between countries 2006–2012. The increased width and colour of the line represent stronger citation links. Only strong citation links are presented where the strength of collaboration was at least 0.03 in one time period between country pairs. The left panel presents citations to (straight black line) and by (curved red line) the USA, whereas the panel on the right shows the data for the UK, Germany and the Netherlands and Italy combined. (Data sourced from Thomson Reuters Web of Science Core Collection.)

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  Figure 8. Impact of collaboration by country 2006–2012. (A) Definitions as per Figure 2; data for internationally collaborative publications. The share of international publications increases as the colour of the point changes from black to light blue. (B) For each country, the share of outstandingly cited international publications in their total international publications is compared with the share of outstandingly cited domestic publications in their total domestic publications. (Data sourced from Thomson Reuters Web of Science Core Collection.)