1. The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush, Midlothian, Scotland, United Kingdom.
2. Departament de Ciència Animal, Universitat de Lleida – Agrotecnio-CERCA Center, Lleida, Spain.
3. Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden.
4. The Pig Improvement Company, Genus plc, Hendersonville, TN, USA.