1. From the Department of Gynaecology and Obstetrics, Kyoto University, Japan (K.K., E.K., Y.C., Y.K., H.M., A.H., T.B., N.M., M.M.)
2. Department of Obstetrics and Gynaecology, National Hospital Organization Kyoto Medical Center, Japan (K.K., I.K.).
3. Department of Obstetrics and Gynaecology, Juntendo University, Tokyo, Japan (S.T.)