1. Missouri Center for Reproductive Medicine, Chesterfield, MO, USA
2. Division of Animal Sciences, University of Missouri, Columbia, MO, 65211-5300, USA
3. Department of Obstetrics, Gynecology and Women’s Health, University of Missouri, Columbia, MO, 65211-5300, USA
4. Instituto de Biomedicina de SevillaHospital, Universitario Virgen del Rocío/CSIC/Universidad de, Sevilla, SPAIN