Figure 2.

Number of topic-in-title articles published in 1991–2000 and 2001–2010 periods on chronic pain after the four types of specific surgeries.^a Notes: ^aAlong the vertical axis, the number (#) of articles published in all journals (including surgical journals), the number of articles published in surgical journals (including top 20 surgical journals), and the number of articles published in top 20 surgical journals (listed in the method section). Along the horizontal axis, the four types of specific surgeries with the highest number of published articles.