Oh, on the subject of physicians expatriating and practicing in other countries:
The Anglosphere, and the US in particular, has a huge advantage. English is the world language, and the US/Hollywood cultural exports mean a lot of people outside the US soak up a basic familiarity with US culture. If I say drive-in, prom, high-school football teams, cheerleading etc, most people in the developed world have some idea what that means from US High School comedies, even if their own nations don’t have anything like it.
If you work in IT, or the oil industry, or maybe mining, you may well have English as your working language even in non-English speaking countries.
But dealing with patients is not one of those areas. If you are a GP in a non-English speaking country, a large fraction of your patients may be old, some may be confused and few will be fluent in English.
Basically, a physician leaving the US faces much higher barriers in terms of language
and culture than someone coming the other way. And that is besides the pay issue.
So which countries are most popular for expat doctors? Well according to the OECD it is in order: Israel, New Zealand, Ireland, Australia, the UK, Switzerland, the USA, Sweden, Canada and Spain. Cite. (Originally from the OECD, but the article has a better table)
As we can see, English-language countries dominate. And despite massively higher pay and easier integration, the US does not compare well to other English-language countries in the popularity stakes.
I suppose it is possible that doctors are discouraged by the amount of bureaucracy, a known feature of the US system. Cite.