Text and Data Mining valid from 2019-07-12
Received: 9 April 2019
Accepted: 5 June 2019
First Online: 12 July 2019
Ethics approval and consent to participate
: This study was approved on April 23, 2018, by the local institutional review board. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable
: The authors declare that they have no competing interests.