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Correction notice This article has been corrected since it published Online First. Text within the letter has been amended to improve clarity.
Contributors Considerations based on clinical experience in regional anesthesia and anatomical/histological findings reporting a network among three experted colleagues.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.