Text and Data Mining valid from 2019-10-24
Received: 21 May 2019
Accepted: 24 September 2019
First Online: 24 October 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki, and local regulations. An institutional review board or independent ethics committee at each site approved the protocol, consent form, and any other written information provided to patients or their legal representatives.
: Not applicable.
: The authors declare that they have no competing interests.