Footnotes

• Contributors As the lead author, TK was involved in all stages of patient management and wrote the manuscript. TK and YS performed the treatment. Both authors read and approved the final 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.