Additional file 1.

Multitrait-multimethod matrix. Matrix of correlation for the assessment of construct validity of sets of measures. Instead of "1" along the diagonal (as in a typical correlation matrix) we have substituted an estimate of the test-retest reliability of each measure.

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Labiris et al. BMC Ophthalmology 2008 8:4   doi:10.1186/1471-2415-8-4