1. I Anna Olsson, PhD, is a researcher at the Laboratory Animal Science group at the i3S – Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal.
2. Sandra Pinto da Silva, MSc, is a research fellow at the ISPUP-EPIUnit, University of Porto, Portugal.
3. David Townend, PhD, is Professor of Law and Legal Philosophy in Health, Medicine and Life Sciences in the Department of Health, Ethics and Society, and CAPHRI (Care and Public Health Research Institute), Maastricht University, The Netherlands.
4. Peter Sandøe, D.Phil. (Oxon.), is Professor at the Department of Food and Resource Economics and the Department of Large Animal Sciences, University of Copenhagen, Denmark.