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When Yawning Occurs in Elephants.
Rossman ZT, Hart BL, Greco BJ, Young D, Padfield C, Weidner L, Gates J, Hart LA. Rossman ZT, et al. Front Vet Sci. 2017 Feb 28;4:22. doi: 10.3389/fvets.2017.00022. eCollection 2017. Front Vet Sci. 2017. PMID: 28293560 Free PMC article.