Funding for this research was provided by:
University College London
Article History
Received: 8 April 2018
Revised: 13 August 2018
Accepted: 28 August 2018
First Online: 2 October 2018
Compliance with ethical standards
:
: The scientific guarantor of this publication is Dr Francesco Giganti.
: 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.
: Institutional Review Board approval was not required.
: • review• multicentre study