Footnotes

• Contributors MG offered the research question and oversaw the study along with YE. MG and YE guided RK to investigate specific outcomes and supervised findings of the study. RK collected data and wrote the majority of the manuscript with the guidance of all contributing authors. YE and OS reviewed the results and wrote parts of the manuscript. CV verified the analytical methods and performed statistical analysis. All authors discussed the results and contributed to 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.

• Patient consent for publication Not required.

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