1Department of Obstetrics and Gynecology, Faculty of Medicine, Juntendo University, Hongo 2-1-1, Bunkyo-ku, Tokyo, 113-8431, Japan
2Department of Informative Genetics, Environment and Genome Research Center, Tohoku University Graduate School of Medicine, 2-1 Seiryo-cho, Aoba-ku, Sendai, 980-8575, Japan
3Department of Obstetrics, Fukuoka Children’s Hospital, Tojinmachi 2-5-1, Chuo-ku, Fukuoka 810-0063, Fukuoka, Japan