_:vb50955780 . _:vb50955780 "A nutritional deficiency disease that is characterized by deficiency of niacin (vitamin B3), has_symptom gastrointestinal disturbance, anorexia, diarrhea, dementia, hallucinations, depression, psychosis, and/or non-specific skin changes, and has_material_basis_in deficiency of niacin, often from inadequate diet, malabsorption, or medication side effects."^^ . _:vb50955780 . _:vb50955780 "url:https://www.ncbi.nlm.nih.gov/pubmed/16207585"^^ . _:vb50955780 . _:vb50955780 . _:vb50955780 .