CFH and age-related macular degeneration: In cluster analysis for the citations, we found the following three major clusters in the citation histogram map (Figure 1): (1) complement H factor polymorphism in the ARMD (nodes 831, 832, 833, and 842 in the index 1), (2) treatment of subfoveal choroidal neovascularization in ARMD (nodes 386, 402, and 428), and (3) ranibizumab treatment for neovascular ARMD (nodes 1116 and 1117).