Text and Data Mining valid from 2019-06-20
Received: 6 February 2019
Accepted: 9 May 2019
First Online: 20 June 2019
Ethics approval and consent to participate
: Independent ethics committee and hospital-based institutional review board approvals were obtained, as necessary, for the registry protocol.
: 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.