''Although in some countries in Asia and Africa, it is done. It is also common to put the university one attended after the degree. As in Dr. Lee Hsien Chew MBBS (Oxford). Styling oneself this way in the US is, however, in the poorest of taste''.
Including the name of the university is necessary in some countries. It is the way to show how educated they are. Getting a doctorate from western countries helps physicians receive more clients than others.