Footnotes

• Correction notice The competing interests statement in this letter has been updated since it was first published online.

• Competing interests MH is a Co-Founder, shareholder, and former Chair and Chief Medical Officer of Evena Med which designs and manufactures multi-spectral near infrared light imaging technology for multiple medical applications including vascular access. Evena Med is also an OEM (original equipment manufacturer) for a privately held manufacturer of point of care ultrasound technology.

• Provenance and peer review Not commissioned; internally peer reviewed.