Article History
Received: 28 September 2017
Revised: 16 March 2018
Accepted: 5 April 2018
First Online: 22 May 2018
Compliance with ethical standards
:
: The scientific guarantor of this publication is Prof Andrea Rockall.
: 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 waived by the institutional review board.
: Institutional review board approval was obtained.
: • retrospective• cross-sectional• multicentre study