Text and Data Mining valid from 2019-10-12
Received: 10 May 2019
Accepted: 23 August 2019
First Online: 12 October 2019
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.
: All of the study procedures 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.
: Informed consent was obtained from all participants.