Text and Data Mining valid from 2020-01-28
Received: 16 October 2019
Accepted: 12 January 2020
First Online: 28 January 2020
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of the Faculty of Medicine of the University of Tübingen, Germany (260-2012BO2). All participants gave their written consent for participation and publication of the pseudonymized data.
: The authors declare that they have no competing interests.