You've picked a hell of a confounder there. Cuba's medical corps has been grown as if it were a civil defense project of a country on the brink. They have 2-3 times as many doctors as the rest of us per capita - but it's also a very poor country crippled by a lack of supplies and equipment, and doctors in Cuba often have second jobs where they get their actual income.

http://www.slate.com/articles/news_and_politics/explainer/20...