Received: 19 September 2019
Accepted: 25 November 2019
First Online: 16 December 2019
: All experimental procedures involving the pigs were in compliance with the recommended principles described in the Guide for the Care and Use of Laboratory Animals by the National Research Council of the National Academies and were approved by the USDA-ARS, National Animal Disease Center, Animal Care and Use Committee.Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendations or endorsement by the U.S. Department of Agriculture. The U.S. Department of Agriculture is an equal opportunity provider and employer.
: All authors gave their consent for publication.
: The authors declare no conflicts of interest.