1. Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas
2. Texas College of Osteopathic Medicine, University of North Texas Health Science Center, Fort Worth, Texas
3. Department of Microbiology, Immunology, and Genetics, University of North Texas Health Science Center, Fort Worth, Texas
4. Lawrence D. Longo MD Center for Perinatal Biology, Loma Linda University, Loma Linda, California