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Contributors Special thanks to mother (MU) and baby (AM) for their kind contribution to medical education. Many thanks to Medical Illustration at University Hospitals of Leicester for their informative and high-quality images.
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 Parental/guardian consent obtained.
Provenance and peer review Not commissioned; internally peer reviewed.