Hi, I came across several papers e.g. http://www.sciencedirect.com/science/article/pii/S2213158215000856 where gyrification index (GI) is indicated in 'mm'.
By definition GI is the ratio of two quantities: inner contour/outer contour (http://en.citizendium.org/wiki/Gyrification), therefore, shouldn't GI be 'unitless' then? I am not sure which way is this correct? Thanks.
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