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The third sentence in the second paragraph of the Methods summary should have cited several authors [20-25] instead of Spencer de Gruchy and Roberts [17].
The correct sentence should read as follows, "Percussion marks were identified according to criteria described by several authors [20-25] and compared with cut-marks, carnivore tooth-marks and geochemical etching [48,57-58]."
Competing Interests: No competing interests declared.
