<p>The cumulative numbers of studies published between 1995 and 2009 (solid data points) were fitted well with a power growth model (solid line). The predicted cumulative numbers of GPRD studies were then extrapolated by the fitted power model (hollow data points with short dashed line). The extrapolation should be interpreted cautiously under assumption. Data source: Germany: studies using German health insurance medication claims data <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021404#pone.0021404-Hoffmann1" target="_blank">[8]</a>; France: studies using French reimbursement databases <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021404#pone.0021404-MartinLatry1" target="_blank">[9]</a>; Canada: studies using Manitoba and Saskatchewan administrative health care utilization databases <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021404#pone.0021404-Tricco1" target="_blank">[10]</a>.</p
