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. 2016 Oct 24;6:35812. doi: 10.1038/srep35812

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Copyright © 2016, The Author(s)

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(a) Mean and individual’s OSD and HSD. Individual data are presented in ascending order of PSD. Red filled circles: OSD, Blue filled circles: HSD. (b) Mean and individual’s PSD (HSD subtracted from OSD). Mean HSD was significantly shorter than mean OSD by approximately 1 h (t(14) = 4.547, p < 0.001).