Funding for this research was provided by:
Research Institute for Veterinary Science (550-20170104)
BK 21 Plus Program for Creative Veterinary Science Research (5260-20150100)
Received: 26 May 2018
Accepted: 16 September 2019
First Online: 16 October 2019
Ethics approval and consent to participate
: All protocols strictly adhered to guidelines of the Ethical Animal Experiment of Seoul National University and were approved prior to this study by the Seoul National University Institutional Animal Care and Use and Ethics Committee.
: Not applicable.
: The authors declare that they have no competing interests.