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1: Med Hypotheses. 2008 Aug;71(2):307. Epub 2008 Apr 22.Click here to read Links
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Med Hypotheses. 2008;70(3):488-92.

Yawning...and why yawns are contagious: a theory on evolution and atavism.

PMID: 18434039 [PubMed - indexed for MEDLINE]