Footnotes

• Contributors SRR, YSH, JK and IP were involved in patient care. SRR and IP prepared the manuscript and performed the necessary literature search.

• 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 Obtained.

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