It's always a good idea to explore what other research has been going on in the field of education in general. You may be able to apply what's happening in other fields to medical education. Cross-pollination of ideas is always a good thing.
The ERIC Database is an ideal database to look for other education literature.
Using the Advanced Search feature is the best way to search ERIC.
In addition to articles, you also get access to conference proceedings, book materials, and documents. These additional types of literature are not found in PubMed. Many of the medical education articles DO overlap with those in PubMed.