Footnotes

• Twitter @Sounet1980

• Contributors SS: conception, design, acquisition of data and patient management; YS: interpretation of data. Furthermore, both authors have participated in writing the manuscript. Both authors have read and approved 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 and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

• Patient consent for publication Obtained.

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