1 Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa. Electronic address: geoffrey.fosgate@up.ac.za.
2 Institute for Veterinary Epidemiology and Biostatistics, Freie Universität, Berlin, Germany.
3 Laboratory of Epidemiology and Artificial Intelligence, Faculty of Public Health, University of Thessaly, Thessaly, Greece.