1 Perinatal Center, Hamamatsu University School of Medicine, 1-20-1, Handayama, Higashi, Hamamatsu, Shizuoka, 431-3192, Japan. [email protected].
2 Department of Obstetric Anesthesiology, Center for Maternal-Fetal and Neonatal Medicine, Saitama Medical Center, Saitama Medical University, Kawagoe, Japan.
3 Department of Anesthesiology and Intensive Care, Hamamatsu University School of Medicine, Hamamatsu, Japan.
4 Perinatal Center, Hamamatsu University School of Medicine, 1-20-1, Handayama, Higashi, Hamamatsu, Shizuoka, 431-3192, Japan.