Document is current

Article History

Received: 18 January 2017

Accepted: 25 June 2017

First Online: 4 July 2017

Compliance with Ethical Standards

:

: The author declares that he has 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.

: Informed consent was obtained from all individual participants included in the study.