Rueda Garrido, Daniel http://orcid.org/0000-0002-9338-8061
Article History
Received: 27 September 2019
Accepted: 3 October 2020
First Online: 13 October 2020
Compliance with Ethical Standards
:
: There is no conflict of interest, no funding to be acknowledged and the research doesn't involve human participation. Although I am a member of Hebei Normal University, I follow my own research project with no specific financial support from this institution or any other.
: I thereby confirm that the article follows the ethical standards.