Fig. 2

Increase in country publication output between the periods 2004–2008 and 2009–2013 for five major disease areas (Alzheimer disease, stroke, Parkinson disease, HIV, and diabetes) in absolute terms and relative to the overall output within each country. a Percentage increase in the number of publications overall and in each disease area between the periods 2004–2008 and 2009–2013. The top 14 countries worldwide are ranked according to their contribution during the period 2004–2008. b For each country, the fold increase in the proportion of publications in each disease area relative to the overall increase in the number of publications between the periods 2004–2008 and 2009–2013 is shown. The top 14 countries worldwide are ranked according to their contribution during the period 2004–2008