1. 1Department of Obstetrics and Gynecology, Nihon University School of Medicine, Tokyo, Japan.
2. 2Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Tokyo, Japan.
3. 3Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan.
4. 4Department of Biochemistry, Keio University School of Medicine, Tokyo, Japan.
5. 5Department of Preventive Medicine and Public Health, Keio University School of Medicine, Tokyo, Japan.
6. 6Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
7. 7WPI-Bio2Q Research Center and Central Institute for Experimental Animals, Kawasaki, Japan.