Global pharmaceutical innovation network.

<p>Note: AR Argentina, AT Austria, AU Australia, BE Belgium, CA Canada, CH Switzerland, CN China, CZ Czech Republic, DE Germany, DK Denmark, ES Spain, FI Finland, FR France, GB United Kingdom, IE Ireland, IL Israel, IN India, IT Italy, JP Japan, NL Netherlands, PL Poland, SE Sweden, US United States. Note: Vertex positions determined using spectral graph analytic methods according to the normalized Laplacian so that countries that are strongly interconnected positioned nearer to each other <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0077247#pone.0077247-Higham1" target="_blank">[27]</a>. Node size corresponds to the weighted degree centrality of a country that is defined as the sum of a countrýs co-intventorships, the strength of the lines correspond to total co-inventorships between two countries.