1. Department of Animal Medicine and Surgery; Faculty of Veterinary Medicine; Autonomous University of Barcelona; Bellaterra (Cerdanyola del Vallès) Spain
2. Nuffield Department of Obstetrics and Gynaecology; University of Oxford; John Radcliffe Hospital; Oxford UK
3. Department of Biochemistry and Molecular Biology; University of Barcelona; Barcelona Spain
4. Department of Biochemistry and Molecular and Cell Biology; IUCA; School of Veterinary Medicine; University of Zaragoza-IUCA; Zaragoza Spain
5. Institute of Biochemistry and Microbiology and Institute of Animal Science; Universidad Austral de Chile; Valdivia Chile