Document is current

Article History

Received: 4 November 2017

Accepted: 23 March 2018

First Online: 19 April 2018

Compliance with ethical standards

:

: The author declares no conflict of interest.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research comittee and with the 1964 Helsinki declaration and its later amendments.

: This article does not contain any study with animals.

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