1. Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
2. Department of Cell Biology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
3. Department of Obstetrics and Gynecology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
4. Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
5. Department of Obstetrics and Gynecology, College of Medicine, Seoul National University, Seoul, S. Korea