Additional file 1: Supplementary Table 1. Semi-structured interview guide. Supplementary Table 2. Regression analysis in the perceptions, barriers, enables, improvements and suggestions about EY by subgroups. Supplementary Figure 1. Summary of the proportion of students response for perceptions about EY by subgroups. Supplementary Figure 2. Summary of the proportion of students response for barriers for EY by subgroups. Supplementary Figure 3. Summary of the proportion of students response for enablers for EY by subgroups. Supplementary Figure 4. Summary of the proportion of students response for improvement and suggestions on EY by subgroups.