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Yu, C., Ying, Z. & Chen, W. The Impact of Calculation Procedure on the Hazard Ratio of N Classifications. Ann Surg Oncol 18 (Suppl 3), 209–210 (2011). https://doi.org/10.1245/s10434-011-1817-x
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DOI: https://doi.org/10.1245/s10434-011-1817-x