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Dr. Khan is a hematologist specializing in multiple myeloma and related plasma cell disorders. General internal medicine physicians, or internists, are primary-care doctors who perform physical exams and treat a wide spectrum of common illnesses in adult men and women. One of every four physicians in the U.S. is an internist, many of whom are certified in one of 19 subspecialties, including cardiology, infectious disease and medical oncology.

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