2.2 Information sources
The search for the papers started on Nov 16, 2018, after all the
relevant records from the literature had been collected. MEDLINE and
Centre for Biosciences and Agriculture International (CABI) databases
were searched from 1864-2018 using the Iowa State University (ISU) Web
of Science interface. The country of investigation and year was not used
as exclusion factors.
The Swine Information Library (SIL) enables access to the Journal of
Swine Health and Production (JSHAP) journal, American Association of
Swine Veterinarians (AASV) Annual Meeting Proceedings (1999-2019), the
International Pig Veterinary Society (IPVS) Congress proceedings
(2000-2016), James McKean (formerly known as Iowa State University)
Swine Diseases Conference proceedings (1996-2018), and the Allen D.
Leman Swine Conference proceedings (2007-2018). These dates were
dictated by the availability of electronic versions. We also searched
the following relevant conference proceedings: American College of
Veterinary Pathologists (ACVP) conference (2012-2018) and American
Association of Veterinary Laboratory Diagnosticians (AAVLD) conference
(2017-2018).