Declaration of conflicting interests: The authors declared the following potential conflicts of interest with respect to the research, authorship and/or publication of this article: S.T. is a spokesman for the Hellenic Ministry of Health; the views expressed here are his own.
Funding: The authors received no financial support for the research, authorship and/or publication of this article.
ORCID iD: Theodore Lytras  https://orcid.org/0000-0002-4146-4122