Statistical analysis
For the descriptive analysis, categorical variables were expressed as absolute and relative frequencies; and quantitative values as mean and range (minimum-maximum values). Comparisons between ECC and DCC groups were carried out with the chi-square or Fisher Exact tests for categorical variables, and t-test or U Mann-Whitney test for quantitative ones, when appropriate. Statistical significance was established with P < .05. All statistical analyses were performed with SAS 9.4.