Article History
Received: 29 November 2017
Accepted: 8 January 2018
First Online: 2 February 2018
Compliance with ethical standards
: This study was performed under the approval of the state committee on animal ethics, Razi University, Kermanshah, Iran. Additionally, recommendations of the European Council Directive (86/609/EC) of November 24, 1986, regarding the protection of animals used for experimental purposes were considered. This article does not contain any studies with human participants performed by any of the authors.
: The authors declare that there is no conflict of interest.