Text and Data Mining valid from 2018-06-15
Received: 23 March 2017
Accepted: 23 March 2018
First Online: 15 June 2018
Ethics approval and consent to participate
: The study was approved by the local institution’s Ethics Committee at the University of Muenster, Germany (reference no. 2013-206-f-S) and was conducted in accordance with the Helsinki Declaration. All patients provided informed written consent to participate in the investigation.
: Consent for publication was obtained from the participants.
: The authors declare that they have no competing interests.
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