1 Fukushima Regional Center for the Japan Environmental and Children's Study, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan. tuyoshim@fmu.ac.jp.
2 Department of Obstetrics and Gynecology, School of Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan. tuyoshim@fmu.ac.jp.
3 Fukushima Regional Center for the Japan Environmental and Children's Study, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan.
4 Department of Obstetrics and Gynecology, School of Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan.
5 Department of Pediatrics, Fukushima Medical University School of Medicine, 1 Hikarigaoka, Fukushima, 960-1295, Japan.
6 Department of Public Health, Fukushima Medical University School of Medicine, 1 Hikarigaoka, Fukushima, 960-1295, Japan.
7 Fukushima Medical Center for Children and Women, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan.