Erythropoietin will be given as the schedule of twice a week for 4 weeks with the dosage of 500 IU/kg for 2 times intravenously and 250 IU/kg subcutaneously for 6 times.

All subjects should participate in active rehabilitation. They received two physical and occupational therapy sessions per day. Post discharge, each participant continued to receive rehabilitation therapy at least 3 days per week for additional 5 months.

Placebo Umbilical Cord Blood will be given except the Experimental arm. Placebo Umbilical Cord Blood was made using peripheral blood. Participants and Investigators maintained as blind.

Placebo Erythropoietin containing Normal Saline

Korean version of Bayley Scale of Infant Development-II (K-BSID-II) Motor Scales (higher value means better motor function: 0 - worst, 111 - best). We reported changes of BSID-II Motor Scale raw score between each assessment time points. Categories of outcome data are values of subtracting the latter scores from the former ones.

Changes on brain Diffusion Tensor Image (DTI); DTI provides quantitative information about the microscopic integrity of white matter. White matter normally possesses a high degree of diffusion anisotropy than gray matter. We can measure fractional anisotropy (FA) value in DTI imaging and it ranges from 0 to 1. Higher FA value of a certain region of interest means the area has more integrity of white matter.

18F-FDG PET imaging was performed twice prior to and then 2 weeks post-treatment. Ninety slices of each emission image were obtained, and all scans were reviewed by a nuclear physician. Spatial pre-processing and statistical analyses were performed using SPM8 implanted in Matlab to compare differences in regional brain glucose metabolism between groups and differences between pre- and post-therapy imaging data. We reported increased areas and decreased areas of glucose metabolism in three groups. We defined that "1" refers to INCREASED areas, "-1", DECREASED areas and "0", just NO CHANGE.

Pediatric Evaluation of Disability Inventory (PEDI) for assessing functional performance in daily activities in children (All values are adjusted and higher value means better functional performance, 0 - worst, 100 - best). We reported here 2 scales and 3 domains of each scale: a Functional Skill Scale (FSS) and a Caregiver Assistance Scale (CAS) which are divided respectively into 3 domains: self care, mobility, and social function. Categories of outcome table are each domain scores measured at each assessment time point.

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 scores mean more independent performance in daily activities. Categories of outcome table are total WeeFIM scores measured at each assessment time point.

Summation of MMT (manual muscle strength test score): summated scores of the manual muscle strength 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 better muscle strength. Categories of outcome table are summation of MMT scores measured at each assessment time point.

QUEST (Quality of Upper Extremity Skills Test) as a standardized measurement tool for assessing hand function consisting of sub-scales; dissociated movement, grasps, weight bearing, and protective extension. These are standardized to range from zero (or below zero in grasp section) to 100 and higher values mean better hand function. We reported QUEST differences between each assessment times.

The number of patients with serious adverse events within each group; Serious adverse events were defined as any event that resulted in death, was life-threatening, required hospitalization or prolonged the hospital stay, or was otherwise serious in the judgment of the investigator.

Active rehabilitation

Total of all reporting groups

Erythropoietin injection (twice a week for 4 weeks with the dosage of 500 IU/kg for 2 times intravenously and 250 IU/kg subcutaneously for 6 times),and active rehabilitation

Active rehabilitation

Korean version of Bayley Scale of Infant Development-II (K-BSID-II) Mental Scales (higher value means better mental function: 0 - worst, 178 - best). We reported changes of BSID-II Mental Scale raw score between each assessment time points. Categories of outcome data are values of subtracting the latter scores from the former ones.

Intention to treat

Korean version of Bayley Scale of Infant Development-II (K-BSID-II) Motor Scales (higher value means better motor function: 0 - worst, 111 - best). We reported changes of BSID-II Motor Scale raw score between each assessment time points. Categories of outcome data are values of subtracting the latter scores from the former ones.

Intention to treat

Changes on brain Diffusion Tensor Image (DTI); DTI provides quantitative information about the microscopic integrity of white matter. White matter normally possesses a high degree of diffusion anisotropy than gray matter. We can measure fractional anisotropy (FA) value in DTI imaging and it ranges from 0 to 1. Higher FA value of a certain region of interest means the area has more integrity of white matter.

18F-FDG PET imaging was performed twice prior to and then 2 weeks post-treatment. Ninety slices of each emission image were obtained, and all scans were reviewed by a nuclear physician. Spatial pre-processing and statistical analyses were performed using SPM8 implanted in Matlab to compare differences in regional brain glucose metabolism between groups and differences between pre- and post-therapy imaging data. We reported increased areas and decreased areas of glucose metabolism in three groups. We defined that "1" refers to INCREASED areas, "-1", DECREASED areas and "0", just NO CHANGE.

Intention to treat

Pediatric Evaluation of Disability Inventory (PEDI) for assessing functional performance in daily activities in children (All values are adjusted and higher value means better functional performance, 0 - worst, 100 - best). We reported here 2 scales and 3 domains of each scale: a Functional Skill Scale (FSS) and a Caregiver Assistance Scale (CAS) which are divided respectively into 3 domains: self care, mobility, and social function. Categories of outcome table are each domain scores measured at each assessment time point.

Intention to treat

GMFM (Gross Motor Function Measure) as a standardized measurement tool for assessing Gross Motor Function consisting of sub-scales; lying & rolling, sitting, crawling & kneeling, standing, walking, running & jumping (range: 0~100 , Higher value means better gross motor function). We reported changes of GMFM between each assessment time points. Categories of outcome table are baseline and values of just subtracting the latter raw scores from the former ones.

Intention to treat

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 scores mean more independent performance in daily activities. Categories of outcome table are total WeeFIM scores measured at each assessment time point.

Intention to treat

Summation of MMT (manual muscle strength test score): summated scores of the manual muscle strength 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 better muscle strength. Categories of outcome table are summation of MMT scores measured at each assessment time point.

Intention to treat

QUEST (Quality of Upper Extremity Skills Test) as a standardized measurement tool for assessing hand function consisting of sub-scales; dissociated movement, grasps, weight bearing, and protective extension. These are standardized to range from zero (or below zero in grasp section) to 100 and higher values mean better hand function. We reported QUEST differences between each assessment times.

Intention to treat

The number of patients with serious adverse events within each group; Serious adverse events were defined as any event that resulted in death, was life-threatening, required hospitalization or prolonged the hospital stay, or was otherwise serious in the judgment of the investigator.

Erythropoietin injection (twice a week for 4 weeks with the dosage of 500 IU/kg for 2 times intravenously and 250 IU/kg subcutaneously for 6 times),and active rehabilitation

Active rehabilitation

One death at 14 wks post-transplantation. She was a 25 mo-old with spastic quadriplegia from profound hypoxia. She was unable to control her head and showed poor oral function. She had been medically stable. The cause was supposed to be suffocation.

Temporary O2 desaturation(89-91%) at the end of UCB infusion in UCB group; O2 desaturation(91%) shortly during sedation for PET in EPO group; O2 desaturation(71-95%) intermittently during 47 min maybe from postictal respiratory depression in control