Funding for this research was provided by:
Other (Please see disclosure statement)
Text and Data Mining valid from 2019-04-08
Received: 21 January 2019
Revised: 7 March 2019
Accepted: 15 March 2019
First Online: 8 April 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Dr. Andrew Plumb.
: 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.
: One of the authors has significant statistical expertise.
: Written informed consent was waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: • retrospective• observational• multicentre study