Text and Data Mining valid from 2017-08-24
Received: 31 May 2017
Accepted: 10 August 2017
First Online: 24 August 2017
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Research Committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.