1 Department of Pediatrics, Dokkyo Medical University School of Medicine, Mibu, Tochigi-ken, Japan; Symphony Hospital, Utsunomiya Cerebrospinal Center, Utsunomiya-city, Tochigi-ken, Japan.
2 Symphony Hospital, Utsunomiya Cerebrospinal Center, Utsunomiya-city, Tochigi-ken, Japan.
3 Department of Pediatrics, Dokkyo Medical University School of Medicine, Mibu, Tochigi-ken, Japan.
4 Medical Science of Nursing, Dokkyo Medical University School of Nursing, Mibu, Tochigi-ken, Japan.