1 Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul 110-744, Republic of Korea ; Cancer Research Institute, Seoul National University College of Medicine, Seoul 110-799, Republic of Korea.
2 Department of Obstetrics and Gynecology, School of Medicine, Keio University, Tokyo 160-8582, Japan.
3 Department of Cell Biology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
4 Department of Obstetrics and Gynecology and Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON, Canada K1Y 4E9.