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Pellagra – The 4 Ds

Pellagra, literally meaning “rough skin” is a manifestation of niacin deficiency Dermatitis Diarrhea Dementia Death

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Measles – The 3 Cs

Classic symptomatology of measles: Cough Conjunctivitis Koplik’s spots Coryza

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Failure to Progress – the 3 Ps

Physiological categories of failure to progress on obstetrics: Power Passenger Passage