Figure 6From: A framework for enhancing spatial and temporal granularity in report-based health surveillance systems Distribution of news articles in the corpus by date of publication. This chart shows the distribution of news articles in our corpus in terms of the publication date. The corpus consists of news articles whose publication dates range from 1996 to 2007. However, the majority of the news articles were published from the middle of 2005 to the end of 2006.Back to article page