Article History
Received: 3 October 2017
Revised: 30 November 2017
Accepted: 29 December 2017
First Online: 18 January 2018
Compliance with ethical standards
: No animals were used in the study.
: 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 authors declare that there is no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.
: It is verified that all the authors had the access to the data and role in the writing of the manuscript.