Wiersinga, Wilmar M.
Article History
Received: 15 July 2019
Accepted: 5 August 2019
First Online: 15 October 2019
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.
: This article does not contain any studies with human participants performed by the author.
: The present paper is a review of papers published in the literature. For informed consent of participants to these previous studies, see original papers.