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. 2011 Jun 13;6(6):e19557. doi: 10.1371/journal.pone.0019557

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Wang et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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4A: Patients with EM1 had a comparable overall survival curves among each substage when EM1 was ignored (P = 0.991). 4B: Patients with EM1 had a distinguishable overall survival curves among each substage when with the consideration of EM1 as N3 stage (P = 0.023).