1. Department of Obstetrics, Perinatal Medical Center, Dokkyo Medical University
2. Department of Advanced Fetal and Developmental Medicine, Tohoku University Graduate School of Medicine
3. Department of Maternal and Fetal Medicine, Miyagi Children's Hospital
4. Division of Fetal Medicine, National Center for Child Health and Development
5. Graduate School of Science and Engineering for Research, University of Toyama
6. Department of Electronic Engineering, Tohoku University Graduate School of Engineering