Text and Data Mining valid from 2019-09-02
Received: 31 May 2019
Accepted: 22 July 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional review board according to the principles of the World Medical Health Association Declaration of Helsinki 2000 for medical research in human subjects and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
: Informed consent was obtained from all the authors of the manuscript.
: The authors declare that they have no competing interests.