Received: 17 December 2019
Accepted: 3 May 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: An Ethical Review Committee Statement was not appropriate for this manuscript, since it is an observational study based on anonymous public data which required no specific consent, nor were associated with experimental procedures and treatments. The authors are available for clarifications.
: Not applicable.
: The authors declare that they have no competing interests.