Statistical analyses
The study population was described using means and standard deviations (SD) for quantitative variables with normal distribution or medians and minimal/maximal values [min; max] otherwise. Frequencies and their associated percentage were used for qualitative variables. The normal distribution of continuous variables was explored graphically. Quantitative variables were compared using Student’s t-test when the distribution was Gaussian, or the Mann-Whitney test otherwise. For qualitative variables, groups were compared using the chi-squared test or Fisher’s exact test. The statistical significance was set at 0.05 and analyses were performed using Excel® software.