Figure 7: Proportional measures of frequency that the search phrases �pain and surgery�, �pain after surgery�, and �anesthesia side effects� were entered by users at the main google search page ( over the time period 2004 � 2010 (x-axis). Each measured time point is expressed as a normalized percentage of the maximum search frequency for all phrases: �pain after surgery�. Web interest in this phrase has steadily increased since 2004. Results are screen shots from the authors� computer using Google Insights for Search (; accessed: April 30, 2011).