WeeFIM (Functional Independence Measure for Children) measures functional independence in daily activities. WeeFIM contains 18 items and each item is ranked from complete dependence (scored as 1) to complete independence (scored as 7). The range is from 18 to 126 and higher score means more independent performance in daily activities.

Pediatric Evaluation of Disability Inventory (PEDI) is used to assess functional performance in daily activities in children (All values are adjusted and higher value means better functional performance, 0 - worst, 100 - best). PEDI consists of 2 scales such as Functional Skill Scale (FSS) and a Caregiver Assistance Scale (CAS) and each scale is composed of 3 domains including self care, mobility, and social function.

QUEST (Quality of Upper Extremity Skills Test) is a standardized measurement tool for assessing upper extremity function consisting of sub-scales; dissociated movement, grasps, weight bearing, and protective extension. QUEST ranges from 0 (or below 0 in grasp section) to 100 and higher values mean better upper extremity function.

Visual perception function will be assessed with one of 3 tools such as DTVP (Developmental Test of Visual Perception), MVPT (Motor-free Visual Perception Test), and VMI (Visual-Motor Integration, Visual Perception and Motor Coordination). Higher value means better visual perception ability.

SCALE (Selective Control Assessment of Lower Extremity) is a measurement tool of selective movement of hip, knee, ankle, subtalar joint and toes. Selective voluntary motor control is graded at each joint as normal (2 points), impaired (1 point) or unable (0 point).

Muscle spasticity of biceps, hip adductors, hamstrings and heel cords is graded according to modified Ashworth scale (MAS).

Dynamic component of spasticity in bilateral hamstrings is graded using modified Tardieu scale (MTS).

Muscle strength is measured using summated scores of manual muscle test (zero=0, trace=1, poor=2, fair=3, good=4, normal=5) for flexors, extensors, abductors, and adductors of bilateral shoulder and hip joints; flexors and extensors of bilateral elbow, wrist, and knee; dorsiflexors and plantar flexors of the ankles (range: 0 ~ 160). Higher score means stronger muscle power.

Diffusion Tensor Image (DTI) of brain MRI (magnetic resonance imaging) provides quantitative information about the microscopic integrity of white matter. White matter normally possesses a high degree of diffusion anisotropy than gray matter. Fractional anisotropy (FA) will be measured and it ranges from 0 to 1. Higher FA value means more integrity of white matter.

18F-FDG PET (Positron emission tomography with fluorine-18-fluorodeoxyglucose) imaging will be performed twice prior to and 12 months after UCB therapy.

Electroencephalography (EEG) will be performed twice prior to and 12 months after UCB therapy.

Median, tibial somatosensory evoked potential (SEP), visual evoked potential (VEP), auditory evoked potential (AEP) will be performed twice prior to and 12 months after UCB therapy.

The numbers of adverse events and subjects with those serious adverse events within each group; A serious adverse event is any untoward medical occurrence that at any dose: results in death or is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, or causes a congenital anomaly/birth defect.