1. Department of Internal Medicine, Reproduction and Population Medicine, Faculty of Veterinary Medicine, Ghent University, B-9820 Merelbeke, Belgium
2. Laboratory for Pharmaceutical Biotechnology, Faculty of Pharmaceutical Science, Ghent University, B-9000 Ghent, Belgium
3. Ghent-Fertility and Stem Cell Team, Department for Reproductive Medicine, University Hospital, Ghent University, B-9000 Ghent, Belgium
4. Department of Physiology, Faculty of Veterinary Medicine, University of Murcia, 30071 Murcia, Spain
5. Department of Veterinary and Biosciences, Faculty of Veterinary Medicine, Ghent University, B-9820 Merelbeke, Belgium