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   O.P. Popova et al, 2022, Arkhiv patologii CrossRef
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   Flavia Ultimescu et al, 2023, Ginecologia.ro CrossRef
3. Research progress of Claudin-low breast cancer
   Chenglong Pan et al, 2023, Frontiers in Oncology CrossRef
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   Francisco G. Ortega et al, 2021, Analytical Chemistry CrossRef
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   Olga P. Popova et al, 2021, Journal of Cancer Research and Clinical Oncology CrossRef