Before revision:  Remarkably, our results point out the presence of early structural changes in the WTW topology: from 2003 on , the WTW becomes more and more compatible with the picture of a network where correlations between countries and products are progressively lost.
After revision:  Our analysis shows early structural changes in the WTW topology: from 2003 on , the WTW becomes more and more compatible with the picture of a network where correlations between countries and products are progressively lost.