Sure : In the us after completing a 3 year residency in internal medicine (im), the internist can go on to complete a fellowship in one of the sub-specialty fields of im. A few complete a combined program and some go on to specialize in a non-internal medicine field (e.g. Anesthesia, surgery, radiology, etc.). Many internists are quadruple board certified (e.g. Int med, pulmonary critical care, sleep).
Answered 11/10/2013
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