Text and Data Mining valid from 2018-06-23
Received: 3 March 2018
Accepted: 9 June 2018
First Online: 23 June 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: 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 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by institutional ethics committee.
: Informed consent was obtained from all individual participants included in the study.