1. Departments of Pharmacology, Obstetrics and Gynecology, and Pathology, Rush University Medical Center, Chicago, IL 60612, USA
2. Department of Pharmacology, Rush University Medical Center, Chicago, IL 60612, USA
3. Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
4. Poultry Research Farm, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
5. Departments of Pathology and Obstetrics and Gynecology, Rush University Medical Center, Chicago, IL 60612, USA
6. Department of Preventive Medicine (Biostatistics), Rush University Medical Center, Chicago, IL 60612, USA
7. Departments of Pharmacology, and Obstetrics and Gynecology, Rush University Medical Center, Chicago, IL 60612, USA
8. Department of Obstetrics and Gynecology, Rush University Medical Center, Chicago, IL 60612, USA
9. Department of Obstetrics and Gynecology, Wayne State University, Detroit, MI 48201, USA