Text and Data Mining valid from 2019-03-18
Received: 5 September 2018
Accepted: 6 March 2019
First Online: 18 March 2019
Ethics approval and consent to participate
: The procedures were in accordance with the Declaration of Helsinki and approved by the local ethics committee (#10006/18).
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.