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Development of Fetal Yawn Compared with Non-Yawn Mouth Openings from 24–36 Weeks Gestation
Figure 1
Apex of yawning and non-yawn mouth openings.
The Figure demonstrates that yawning and non-yawn mouth opening cannot be distinguished from a static image at the apex of the event.
doi: https://doi.org/10.1371/journal.pone.0050569.g001