1. Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, SK, Canada S7N 5B4
2. Center for Reproductive Medicine and Andrology, University of Münster, Domagkstraße 11, 48149 Münster, Germany
3. Department of Obstetrics/Gynecology & Reproductive Sciences, Magee-Womens Research Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
4. Department of Animal Sciences, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea