I don't know if you're doing it already, but in the interest targeting you can include professions too and it will target people who have it set to their "work" on FB; plus adding hospitals to workplace targeting you can quickly close the gap
Thanks for the tip! Were professions added recently? "Doctor of Medicine" wasn't on the list at the time we put up the ads a month ago.
For workplace targetting, it looks like none of the hospitals in our current markets (Balkans) are in the system, so it's not as useful. We had a similar problem when trying to target people with "Medical School" as education and got something like 10 people total, seems education as an attribute is counted only for US-based users.
And as another handy tool, you can use the FB ads api without authentication to perform certain types of search: http://graph.facebook.com/search?type=adworkplace&q=hospital... and build your targeting criteria
Hope it helps :)