1 Department of Pediatrics, University of Tsukuba Hospital, Ibaraki, Japan.
2 Department of Pediatrics, University of Tsukuba Hospital, Ibaraki, Japan. Electronic address: hitaka.daisuke.gn@un.tsukuba.ac.jp.
3 Department of Pediatrics, University of Tsukuba Hospital, Ibaraki, Japan; Department of Child Health, Institute of Medicine, University of Tsukuba, Ibaraki, Japan.
4 Center for Medical Genetics, Keio University School of Medicine, Tokyo, Japan.
5 Department of Pediatrics, University of Tsukuba Hospital, Ibaraki, Japan; Department of Child Health, Institute of Medicine, University of Tsukuba, Ibaraki, Japan; Center for Medical Genetics, Keio University School of Medicine, Tokyo, Japan.
6 Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan.