Received: 3 November 2020
Accepted: 10 March 2021
First Online: 17 May 2021
: Not applicable. The data were collected by each author from the manual analysis of textual guidelines published in each country. As a consequence, no human person was involved in the study, and thus there was no need for verbal or written consent, and no need for ethics committee’s approval.
: Not applicable.
: The authors declare that they have no competing interests.