Text and Data Mining valid from 2018-10-08
Received: 5 April 2018
Accepted: 1 October 2018
First Online: 8 October 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures were applied in accordance with the ethical standards of the institutional research and ethics committee and with the 1964 Helsinki declaration and its later amendments. Informed consent was obtained from all individual participants included in the study.