Footnotes

• Contributors MW examined the patient and conceived the idea for the case report. JH-EK wrote the first draft of the manuscript. MW, JH-EK and JS-YW reviewed and amended the manuscript.

• 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.

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