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   Mahin Ahangar Oskouee et al, 2014, Intervirology CrossRef
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   Caroline E. Ford et al, 2004, Cancer Research CrossRef
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   James F. Holland et al, 2004, Clinical Cancer Research CrossRef
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   Allan Bar-Sinai et al, 2005, Cancer Research CrossRef
5. Is MMTV associated with human breast cancer? Maybe, but probably not
   Raisa Perzova et al, 2017, Virology Journal CrossRef