1 Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan; Department of Pathology and Laboratory Medicine, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.
2 Department of Medical Genetics, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.
3 Department of Genetic Research, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.
4 Division of Developmental Genetics, Institute of Resource Development and Analysis, Kumamoto University, Kumamoto, Japan.
5 Department of Pathology and Laboratory Medicine, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.
6 Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan.