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Nobutada Tachi
School of Health Science, Sapporo Medical University
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Yukie Watanabe
Department of Pediatrics, Sapporo Medical University, School of Medicine
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Naoki Kozuka
School of Health Science, Sapporo Medical University
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Kazuhiro Ohya
Department of Pediatrics, Sapporo Medical University, School of Medicine
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Sunzo Chiba
Department of Pediatrics, Sapporo Medical University, School of Medicine