I just got a retail internship a few weeks ago, and I'm generally happy with it, but looking long-term, I would also want to try and attain a hospital internship. Assuming its not feasible to work as both a retail and hospital intern at the same time (due to time constraints), AND assuming a hospital position actually opens up, how would one make the switch? More specifically, would it be possible to retain a positive relationship with my current (retail) employer, or would that bridge be 'burned'?