1 Department of Obstetrics and Gynecology, Saitama Medical Center, The Jichi Medical University, 1-847 Amanuma, Omiya, Saitama, Saitama 330-8503, Japan. Electronic address: [email protected].
2 Department of Obstetrics and Gynecology, International University of Health and Welfare, 1-847 Amanuma, Omiya, Saitama, Saitama 330-8503, Japan.
3 Department of Obstetrics and Gynecology, Saitama Medical Center, The Jichi Medical University, 1-847 Amanuma, Omiya, Saitama, Saitama 330-8503, Japan.