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Contributors JT, AA, and PP contributed equally to this letter.
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 AA is an Anatomy Faculty with Allergan Academy of Excellence. PP received equipment support from Sonosite Fujifilm Canada.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.