Disclose all of it on all further applications. As mentioned, "expunging" isn't perfect, and it depends on the state, and who is asking. "Expunged" records are deleted and discarded, they are simply labeled as expunged, and so depending on whom asks, they might show up.
Bottom line is that no one is going to care about this issue in the past. But, if you don't disclose them and then they show up on a search, then THAT becomes a new problem.
I don't believe that hospitals do background checks on students. So, the next time you will need to deal with this is in your residency applications.