1. Department of Obstetrics and Gynecology (M.I., A.I., M.N., S.M.), Nagoya University Hospital, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
2. Nagoya University School of Medicine; and Maternity and Perinatal Care Center (Y.O.), Nagoya University Hospital, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
3. Laboratory of Molecular Pathogenesis (T.S.), Nagoya University Hospital, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
4. Division of Pathology, Clinical Laboratory (T.N.), Nagoya University Hospital, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan