The forgotten plague.
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D049673:History, 20th Century; D010383:Pellagra / Q000209:etiology / Q000266:history; D011203:Poverty / Q000266:history; D011634:Public Health / Q000266:history / Q000379:methods; D012106:Research / Q000266:history; D012107:Research Design; D012423:Rural Health / Q000145:classification / Q000266:history / Q000639:trends; D015144:Southeastern United States / Q000453:epidemiology