Sex difference in the near-24-hour intrinsic period of the human circadian timing system.
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Proc Natl Acad Sci U S A. 2011 Sep 13;108 Suppl 3(Suppl 3):15602-8. doi: 10.1073/pnas.1010666108. Epub 2011 May 2.
Proc Natl Acad Sci U S A. 2011.
PMID: 21536890
Free PMC article.