Text and Data Mining valid from 2018-04-26
Received: 29 September 2017
Accepted: 21 March 2018
First Online: 26 April 2018
: Animal handling and euthanasia procedures followed the ethical guidelines of and were approved by the USDA-ARS Institutional Animal Care and Use Committee of the Beltsville Agricultural Research Center.
: Not applicable.
: The authors declare that they have no competing interests.