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. 2022 Jun 13;23:22. doi: 10.1186/s40510-022-00413-8

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Fig. 1 — Landmarks and boundaries of the volume of interest (VOI). A) Medio-sagittal scan: Na point (most anterior point of the frontonasal junction), C3AI point (most anterior inferior point on the third cervical vertebra) and C2SP point (most superior posterior point on the second cervical vertebra); B) Coronal scan: OR points (right and left most inferior point of the orbit)