This is a heads up from Tyler Cowen.

Three years of medical school in Tanzania results in only a 1 percentage point increase in the probability of a correct diagnosis. In Paraguay, the amount of time a doctor spends with a patient has nothing to do with the severity of the patient's illness.

This is from "The Quality of Medical Advice in Low-Income Countries," by Jishnu Das, Jeffrey Hammer, and Kenneth Leonard, in the Spring 2008 issue of the Journal of Economic Perspectives.