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. Author manuscript; available in PMC: 2014 May 30.
Published in final edited form as: Twin Res Hum Genet. 2007 Oct;10(5):683–694. doi: 10.1375/twin.10.5.683

Figure 2. Sample characteristics of the extant MRI twin studies on typical populations.

Figure 2

Note: To facilitate comparisons with singleton and sibling subsamples, individual twins are counted rather than twin pairs. Several reports share overlapping samples, either derived from the National Heart, Lung, and Blood Institute sample (1), the Netherlands Twin Registry (2), or NIMH’s longitudinal pediatric imaging study (3).

* = reports based on data from pediatric populations.