Affiliation: | 1. Department of Pediatrics, Nagoya City University Medical School, Kawasumi, Mizuho, 467, Nagoya, Japan 2. Department of Pediatrics, Chiba University School of Medicine, Inohana, 280, Chiba, Japan 3. The First Department of Medicine, Toho University School of Medicine, Ohmori, 143, Tokyo, Japan 4. Department of Maternal and Child Health, School of Health Sciences, Faculty of Medicine, University of Tokyo, Hongo, 113, Bunkyo-ku, Tokyo, Japan 5. Department of Pediatrics, Kanagawa Children's Medical Center, Mutsukawa, 232, Yokohama, Japan
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