1 Department of Obstetrics and Gynecology, University of Fukui, 23-3 Matsuoka, Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan. kawamuu@u-fukui.ac.jp.
2 Department of Obstetrics and Gynecology, University of Fukui, 23-3 Matsuoka, Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan.
3 Department of Pediatrics, University of Fukui, 23-3 Matsuoka, Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan.