Footnotes

• Twitter @BalogluMD, @AzizNazhaMD

• Contributors OB wrote the draft of the manuscript. OB, SQL and AN revised and finalised the manuscript prior to submission. OB prepared the figure. All authors approved the final manuscript and figure.

• 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 Commissioned; externally peer reviewed.