Text and Data Mining valid from 2018-08-30
Received: 4 July 2018
Accepted: 12 August 2018
First Online: 30 August 2018
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the principles of 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.