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    Schneider, T., Jahn, H. U., Schmidt, W., Riecken, E. O., Zeitz, M., & Ullrich, R. (1995). loss of CD4 T lymphocytes in patients infected with human immunodeficiency virus type 1 is more pronounced in the duodenal mucosa than in the peripheral blood. Berlin Diarrhea/Wasting Syndrome Study Group.. Gut, 37(4), 524–529. http://access.bl.uk/ark:/81055/vdc_100135173968.0x000049