1 Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawahigashi, Kodaira, Tokyo 187-8502, Japan; Medical Genome Center, NCNP, Kodaira, Tokyo, Japan; Department of Pediatrics, Showa General Hospital, Kodaira, Tokyo, Japan.
2 Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8601, Japan.
3 Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawahigashi, Kodaira, Tokyo 187-8502, Japan; Medical Genome Center, NCNP, Kodaira, Tokyo, Japan.
4 Medical Genome Center, NCNP, Kodaira, Tokyo, Japan.
5 Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawahigashi, Kodaira, Tokyo 187-8502, Japan; Medical Genome Center, NCNP, Kodaira, Tokyo, Japan. Electronic address: nishino@ncnp.go.jp.