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Fig. 2. —Graph shows absolute number of advertisements (bars) each month in American Journal of Roentgenology and Radiology from January 1991 through December 2002, with 12-month rolling average (red line) calculated to reduce seasonal variation. Note that rolling average peaked in summer of 1992, bottomed out at end of 1995, and peaked again during fall of 2001. Also note obvious downtrend in rolling average from February to December 2002.