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Fig. 4. The distribution of cluster sizes for each treatment group compared with a Poisson (random) distribution. The frequency of cluster sizes for the (A) T3-implanted group (black bars) and the (B) placebo group (black bars) compared with a frequency distribution generated by a truncated Poisson process (gray bars in A and B). Both distributions are significantly different from random (T3 implant, {chi}2=12.6697, P=0.0004; placebo, {chi}2=7.0978, P=0.008).