Text and Data Mining valid from 2019-04-13
Received: 23 January 2019
Accepted: 25 March 2019
First Online: 13 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study protocol was approved by the local ethical research committee (reference number 2014/CE85).
: Informed consent was obtained for the collection of anonymized data and their analysis.