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\bibitem{Koolen_etal2014} Koolen, B. B., Vidal-Sicart, S., Benlloch, J. M., \& Olmos, R. A. V. (2014). Evaluating heterogeneity of primary tumor 18 F-FDG uptake in breast cancer with a dedicated breast PET ( MAMMI): a feasibility study based on correlation with PET/CT. \textit{Nucl. Med. Commun.}, \textit{35}(5), 446--452.

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