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 (www.google.com) 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 (http://www.google.com/insights/search/#; accessed: April 30, 2011).