1. Department of Pediatrics; Tohoku University School of Medicine; 2-1 Seiryo-machi, Aoba-ku Sendai Miyagi 980-8575 Japan
2. Department of Pediatric Neurology; Miyagi Children's Hospital; 4-3-17, Ochiai, Aoba-ku Sendai Miyagi 989-3126 Japan
3. Department of Pediatric Neurology; Takuto Rehabilitation Center for Children; Sendai 982-0241 Japan
4. Department of Medical Genetics; Tohoku University School of Medicine; 2-1 Seiryo-machi, Aoba-ku Sendai Miyagi 980-8575 Japan
5. Division of Cell Proliferation; United Centers for Advanced Research and Translational Medicine; Tohoku University Graduate School of Medicine; 2-1 Seiryo-machi, Aoba-ku Sendai 980-8575 Japan
6. Division of Interdisciplinary Medical Sciences; United Centers for Advanced Research and Translational Medicine; Tohoku University Graduate School of Medicine; 2-1 Seiryo-machi, Aoba-ku Sendai 980-8575 Japan