residency in USA is not the final step in your medical career, but its one of the
most important. You have to overcome many difficulties on your way to get the
residency you want and to successfully complete it.
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In the early 1960s, a Cardiologist by the name of David Littmann, MD invented the first advanced acoustic stethoscope. This device was made up of an open and closed chest piece which allowed a person to listen to low-pitched sounds with a short singl