1. Departments of Obstetrics and Gynecology, St. Marianna University School of Medicine, Sugao, Miyamae-ku, Kawasaki 216-8511, Japan
2. Department of Neurobiology, Nagasaki University Graduate School of Biomedical Science, Sakamoto 1-12-4, Nagasaki 852-8523, Japan
3. Department of Emergency and Critical Care Medicine, St. Marianna University School of Medicine, Sugao, Miyamae-ku, Kawasaki 216-8511, Japan
4. Department of Biology, College of Liberal Arts and Sciences, Tokyo Medical and Dental University, Konodai 2-8-30, Ichikawa, Chiba 272-0827, Japan