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Human T-cell leukemia virus type I (HTLV-1) proviral load and disease progression in asymptomatic HTLV-1 carriers: a nationwide prospective study in Japan. <i>Blood<\/i> 116: 1211\u20131219.","DOI":"10.1182\/blood-2009-12-257410"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Jacobs RM, Heeney JL, Godkin MA, Leslie KE, Taylor JA, Davies C, Valli VE.  1991. Production and related variables in bovine leukaemia virus-infected cows. <i>Vet Res Commun<\/i> 15: 463\u2013474.","DOI":"10.1007\/BF00346546"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Kale M, Bulut O, Yapkic O, Gulay MS, Pehlivanoglu F, Ata A, Yavru S.  2007. Effects of subclinical bovine leukemia virus infection on some production parameters in a dairy farm in southern Turkey. <i>J S Afr Vet Assoc<\/i> 78: 130\u2013132.","DOI":"10.4102\/jsava.v78i3.303"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Klein SL.  2012. 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