Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Acknowledgements
None.

Authors’ contributions
Both authors wrote and revised the manuscript. The author(s) read and approved the final manuscript.

Authors’ information
No further information.

Funding
No specific funding.

Availability of data and materials
Not applicable.

Ethics approval and consent to participate
Not applicable.

Consent for publication
Both Co-Editors-in-Chief consent to publication.

Competing interests
Both authors declare no competing interests.