1 Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan. nkumagai@fujita-hu.ac.jp.
2 Department of Pediatrics, Fujita Health University School of Medicine, 1-98, Dengakugakubo, Kutsukakecho, Toyoake-Shi, Aichi-Ken, 470-1192, Japan. nkumagai@fujita-hu.ac.jp.
3 Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan.
4 Department of Anatomic Pathology, Tohoku University School of Medicine, Sendai, Japan.
5 Department of Pathology, The Jikei University School of Medicine, Tokyo, Japan.