re: Why do people think that American doctors are better than other countries?

I didn't open your links, but from your quotes, unless I misread, I only see studies regarding U.S. doctors. How do they compare with doctors similarly situated in other parts of the world?

Additionally, did you consider the possibility that it may be more difficult to get into medical schools in the US, that generally only the most qualified applicants are accepted and thus the school has a vested interest in retaining students who they enroll?

Moreover, what does the attrition rate have to do with the quality of training and the doctors who graduate from the program? I'm sure the majority of prestigious professional schools in the U.S and the world for that matter also have low attrition rates.