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23 immunological markers involved in PHID, plotted on the first two Principal Components (PC). ALTADIH Cohort, 2007-2010. Immunological markers are well represented by the component when they are far from the center and close to the corresponding axis. Two markers are: 1) positively correlated if close to each other; 2) not correlated if in a rectangular position; 3) negatively correlated if on the opposite side.
