An article published ahead of print on October 3, 2017 in the journal Proceedings of the National Academy of Sciences of the USA suggests that political beliefs predict the professional decisions of primary care physicians. The article is discussed in a piece in the New York Times that appeared on October 6, 2016.
The New York Times item can be accessed at http://www.nytimes.com/2016/10/07/upshot/your-surgeon-is-probably-a-republican-your-psychiatrist-probably-a-democrat.html?_r=0.