Funding for this research was provided by:
Japan Society for the Promotion of Science (15H01619, 26118509, 15H05309)
Received: 24 April 2016
Revised: 31 October 2016
Accepted: 10 November 2016
First Online: 24 November 2016
Compliance with ethical standards
: The experimental procedure for the horses was approved by the Institutional Animal Care and Use Committee (Permission number: 27-12-02) and carried out according to the Kobe University Animal Experimentation Regulation. All procedures adhered to the Japanese Act on the Welfare and Management of Animals.
: We have no competing interests.