Footnotes

• Contributors YS conceived the idea and led in conducting the survey. GR helped in conducting the survey and analysis. YS, GR and SJ contributed to 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.

• Patient consent for publication Not required.

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