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. 2013 Mar 11;8(3):e58994. doi: 10.1371/journal.pone.0058994

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© 2013 Murakoshi 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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Two luminance distribution dimensions (standard deviation and skewness) have a significant influence on PFS (R² = .74, F = 8.43, p<.05). Only standard deviation significantly and positively influenced PFS (beta = .79, p<.05).