Data sharing not applicable to this article as no datasets were generated or analysed during the current study. Video S1: Illustrative (and metaphorical) ultrasound image demonstrates a bifid greater occipital nerve (arrowheads) on the right side (resembling the eye mask of a Ninja Turtle). iocm, inferior obliquus capitis muscle; sscm, semispinalis capitis muscle. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Yalçınkaya et al. (Fri,) studied this question.