Funding

Not applicable.

Conflicts of interest

The author has no conflicts of interest that are directly relevant to the content of this article.

Ethics approval

Not applicable.

Availability of data and material

Data sharing is not applicable to this article.

Code availability

Not applicable.

Consent to participate

Not applicable.

Consent for publication

Not applicable.

Author Contributions

Souad Skalli designed the programme, wrote the manuscript, and reviewed and quality checked the data and manuscript. The author read and approved the final version.