1. Department of Neurosurgery Korea University Anam Hospital Seoul Korea
2. Department of Neurosurgery Samsung Medical Centre Sungkyunkwan University School of Medicine Seoul Korea
3. Department of Pathology Korea University College of Medicine Seoul Korea
4. Department of Biochemistry and Molecular Biology Korea University College of Medicine Seoul Korea
5. The BK21 Plus Program Korea University College of Medicine Seoul Korea
6. Department of Medicine Vanderbilt University School of Medicine Nashville TN USA
7. Vanderbilt Centre for Bone Biology Vanderbilt University School of Medicine Nashville TN USA