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Pellagra Synonyms Niacin deficiency Presentation stereotypical Age and sex Any age and either sex; more common in developing countries in which malnutrition is prevalent, but may be seen in industrialized countries where factors for malnutrition, e.g., alcoholism, are rife; when classic in its presentation, pellagra is characterized clinically by a tetrad of dermatitis, diarrhea, and […]