1 Department of Obstetrics and Gynecology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8666, Japan.
2 Department of Obstetrics and Gynecology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8666, Japan. kurobei343@med.showa-u.ac.jp.
3 Division of Pathology, Department of Oral Diagnostic Sciences, Showa University School of Dentistry, 1-5-8 Hatanodai, Shinagawa, Tokyo, 142-8666, Japan.
4 Information System Department GeneTech, Inc. 2-6-7 Kazusa-Kamatari, Kisarazu, Chiba, 292-0818, Japan.