1. Perinatal Center and Department of Obstetrics and Gynecology, Miyazaki Medical College, Miyazaki; Department of Obsterics and Gynecology, Kagoshima City Hospital, Kagoshima; the Department of Veterinary Medicine, Kagoshima University, Kagoshima, Japan;
2. Perinatal Center and Department of Obstetrics and Gynecology, Miyazaki Medical College, Miyazaki; the Department of Obsterics and Gynecology, Kagoshima City Hospital, Kagoshima; the Department of Veterinary Medicine, Kagoshima University, Kagoshima, Japan