Text and Data Mining valid from 2019-11-05
Received: 25 July 2019
Accepted: 28 October 2019
First Online: 5 November 2019
Ethics approval and consent to participate
: All analyses conducted based on previous published studies, therefore no ethical approval and patient consent are required. All previous published studies were approved by ethics committee respectively.
: The authors declare that they have no competing interest.
: No applicable.