Document is current

Article History

Received: 4 August 2015

Accepted: 17 November 2015

First Online: 9 December 2015

Compliance with Ethical Standards

:

: No funding was provided for this research.

: The authors declare that they have no competing interests.

: The article does not contain any studies with human participants performed by any of the authors.

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