Statistical analysis
Data analysis was performed using Chi-square analysis to test differences in nominal variables between groups, Fisher test was used when there were no criteria for using Chi-square test, and Mann-Whitney test was used for quantitative variables. All reported p values represented two-tailed tests, with values <0.05 considered statistically significant.
The study was conducted according to the principles of the Declaration of Helsinki and was approved by the Ethics Committee of University Regional Hospital of Málaga. All the participants were informed orally about the study and gave the corresponding informed consent.