Results were expressed as mean and standard deviation (SD), except for sociodemographical and immunological results which were expressed as median and interquartile ranges (IQRs) for quantitative variables or as frequencies and percentages for qualitative variables. To compare categorical variables Pearson χ2 or Fisher exact tests were used, whereas quantitative variables were compared using the Mann–Whitney U test. All tests with a P value <.05 were considered statistically significant. Raw scores on cognitive tests were transformed into a standard form (z scores), where the transformation was based on knowledge about the standardization sample mean and SD by each test. SPSS v. 24 was used for data analysis.

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