1. Department of Obstetrics and Gynecology, Gangnam Severance Hospital Yonsei University College of Medicine Seoul Korea
2. Department of Obstetrics and Gynecology Kyung Hee University Hospital at Gangdong Seoul Korea
3. Weill Cornell Medical College New York New York USA
4. Molecular Imaging Branch, Center for Cancer Research, National Cancer Institute National Institutes of Health Bethesda Maryland USA
5. Department of Obstetrics and Gynecology Yonsei University College of Medicine Seoul Korea
6. Institute of Women's Life Medical Science Yonsei University College of Medicine Seoul Korea