Text and Data Mining valid from 2017-04-19
Received: 12 June 2015
Accepted: 5 April 2017
First Online: 19 April 2017
Compliance with Ethical Standards
: The Authors declare that they have no conflict of interest.
: All procedures performed on human participants were in accordance with the ethical standards of the institutional research committee and with ethical standards comparable to the 1964 Helsinki declaration and its later amendments.
: Informed consent was obtained from all individual participants that were included in the study. The data obtained from the participants were solely for research purposes and not for any personal gains.