Eliut,
A common denominator for your research population can be the fact that they all have awareness of national law; in particular to ordinances that deal with health. Hence even before entering this study, subjects might have formed preconceived notions on suicide that might not have been warranted by their proximity to/contact with victims/or those attempting to commit suicide. This may suggest an approach to stigma that stems from the very choice of their academic matriculation. Hence the belief that 'doctors save life' may be paramount to these medical student as an acknowledgement that those that either attempt or have committed suicide are evidence of their inability to 'save lives'.
Cheers,
Winston