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Information: A medical specialty concerned with the diagnosis and treatment of diseases of the internal organ systems of adults. Subspecialities include: Cardiology, Endocrinology, Gastroenterology, Hematology, Medical Oncology, Nephrology, Pulmonary Medicine,
Dr. Roger G. Mazlen, M.D. Dr. Roger G. Mazlen, M.D.: Practice based in Floral Park, New York specializing in Chronic Fatigue Syndrome and clinical nutrition. (Internal Medicine) http://www.cfsmedoc.com