1. Department of Obstetrics and Gynecology (S.M., T.O., T.T., K.T., H.K.), Yamagata University, Faculty of Medicine, Yamagata 990-9585, Japan;
2. Laboratory of Molecular Brain Science (T.Y.), Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan