Article History
Received: 25 May 2017
Accepted: 5 February 2018
First Online: 14 February 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All animals received human care in compliance with the Guide for Care and use of Laboratory. Animals published by the National Institutes of Health (NIH publication No. 85-23, revised 1985). The study was approved by the local ethics committee of our veterinary school.