Table 2.

Annual citation frequency and journal summary

Annual number of citations for each paper are presented as a heat map, illustrating an explosion of interest in this topic in 2008/2009. Four out of the top five papers, accounting for 67% of total citations, were published in the Journal of the American Medical Association. Bolded values in the Citation total column denote the top five most frequently cited papers in the corpus. Note that four of these top five are also the most internally cited papers in Figure 3.