Text and Data Mining valid from 2019-06-06
Received: 8 April 2019
Revised: 23 May 2019
Accepted: 29 May 2019
First Online: 6 June 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures involving human participants were in accordance with the ethical standards of the institutional guidelines, the national research committee, and the 1964 Helsinki declaration.
: Informed consent was obtained from all individual participants included in this study.