Text and Data Mining valid from 2018-05-31
Received: 19 April 2018
Accepted: 28 May 2018
First Online: 31 May 2018
Compliance with Ethical Standards
: The authors declare that they have no conflicts of interest.
: All procedures performed were in accordance with the ethical standards of the institutional ethics committee and with the 1964 helsinki declaration and its later amendments or comparable ethical standards.
: All participants were adequately informed about the procedure and an informed written consent was taken and the participants were then recruited for the study.