Article History
Received: 2 December 2019
Revised: 6 December 2019
Accepted: 18 December 2019
First Online: 21 January 2020
Compliance with ethical standards
:
: The scientific guarantor of this publication is Denis Le Bihan.
: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
: No complex statistical methods were necessary for this paper.
: Written informed consent was not required for this study because it is not an investigational study.
: Institutional Review Board approval was not required because it is not an investigational study.
: • This is not an investigational study (special report).