Article History
Received: 15 December 2017
Accepted: 13 March 2018
First Online: 9 May 2018
Compliance with ethical standards
:
: SÖ reports no potential conflicts of interest. KA reports personal fees from Bard outside the submitted work. JR reports personal fees from Bard and Merck, outside the submitted work.
: This study received no financial support from extramural sources. We have full control of all primary data and agree to allow the journal to review the data if requested.
: For this type of study formal consent was not required.